All Words Glossary

Glossary of Anatomy Terms
beginning with letter M
Browse the Anatomy Glossary

macrocephalic Tweet Definition of macrocephalic Like Definition of macrocephalic on Facebook
  1. having an abnormally large head
Maidenhead Tweet Definition of Maidenhead Like Definition of Maidenhead on Facebook
proper noun
  1. a town in Berkshire, England
malleus Tweet Definition of malleus Like Definition of malleus on Facebook
noun (pluralmallei)
  1. (anatomy) The small hammer-shaped bone of the middle ear.
mamma Tweet Definition of mamma Like Definition of mamma on Facebook
noun (mammae)
  1. (anatomy) The milk-secreting organ of female humans and other mammals which includes the mammary gland and the nipple or teat; a breast; an udder.
  2. Another term for mama or mother.
mammary Tweet Definition of mammary Like Definition of mammary on Facebook
noun (pluralmammaries)
  1. A breast (of a woman or a female animal)
adjective (no comparative or superlative)
  1. (biology) Of or relating to a breast or breasts (of a woman or a female animal).
mammary arteries and veins
mammary gland Tweet Definition of mammary gland Like Definition of mammary gland on Facebook
noun (pluralmammary glands)
  1. (anatomy) A gland that secretes milk for suckle, suckling an infant or offspring.
mandible Tweet Definition of mandible Like Definition of mandible on Facebook
  1. The lower jaw, especially the lower jawbone.
  2. One of a pair of mouthparts of an arthropod designed for holding food.
manus Tweet Definition of manus Like Definition of manus on Facebook
noun (manus)
  1. (obsolete) A hand, as the part of the fore limb below the forearm in a man, or the corresponding part in other vertebrates.
  2. (obsolete, Roman law) The power over other people, esp. that of a man over his wife.
marrow Tweet Definition of marrow Like Definition of marrow on Facebook
  1. (uncountable) The substance inside bones which produces blood cells.
    1. (countable) A kind of vegetable like a large courgette/zucchini or squash.
    • 1847 Sir Robert Schomburgh, Steam-Boat Voyage to Barbados, Bentley's Miscellany, Vol XXII, London: Richard Bentley, page 37.
    • : The finest European vegetables, cabbages, cauliflowers, potatoes, vegetable , were lying in the market-hall, awaiting purchasers.
masseter Tweet Definition of masseter Like Definition of masseter on Facebook
  1. (Anatomy): The large muscle which raises the under jaw, and assists in mastication.
mastoid Tweet Definition of mastoid Like Definition of mastoid on Facebook
  1. (anatomy) The mastoid process.
  1. Of or relating to the mastoid process.
  2. Shaped like a breast or nipple.
mastoid process Tweet Definition of mastoid process Like Definition of mastoid process on Facebook
  1. The conical, nipple-like projection of the petrous part of the temporal bone, that is situated behind the ear in humans and many other vertebrates, and serves as a site of muscle attachment.
matrix Tweet Definition of matrix Like Definition of matrix on Facebook
noun (matrices)
  1. (obsolete) The womb. The concept of an enclosure is common to many of the other uses of .
  2. (biology) The material or tissue in which more specialized structures are embedded.
  3. (biology) An extracellular matrix, the material or tissue between the cells of animals or plants.
  4. (biology) Part of the mitochondrion.
  5. (biology) The medium in which bacterium, bacteria are cultured.
  6. (mathematics) A rectangular arrangement of numbers or terms having various uses such as transforming coordinates in geometry, solving system of linear equations, systems of linear equations in linear algebra and representing graphs in graph theory.
  7. (computing) A two-dimensional array.
  8. A table of data.
  9. (geology) A geological matrix, the outer material of a rock consisting of larger grains embedded in a material consisting of smaller ones.
  10. (archaeology) The sediment surrounding and including the artifacts, features, and other materials at a site.
  11. (analytical chemistry) The environment from which a given sample is taken.
maxilla Tweet Definition of maxilla Like Definition of maxilla on Facebook
noun (pluralmaxillae or maxillas)
  1. Either of the two bones that together form the upper jaw.
meatus Tweet Definition of meatus Like Definition of meatus on Facebook
noun (plural: or meatuses)
  1. (anatomy) an opening or passage in the body
mechanoreceptor Tweet Definition of mechanoreceptor Like Definition of mechanoreceptor on Facebook
  1. (biology) any receptor that provides an organism with information about mechanical changes in its environment, such as movement, tension and pressure
media Tweet Definition of media Like Definition of media on Facebook
noun (plural:mediae)
  1. (anatomy) the middle layer of the wall of a blood vessel or lymph vessel which is composed of connective and muscular tissue. (tunica media, between the tunica interna and tunica externa).
mediad Tweet Definition of mediad Like Definition of mediad on Facebook
  1. Toward the middle line.
mediastinum Tweet Definition of mediastinum Like Definition of mediastinum on Facebook
noun (mediastin, a)
  1. (anatomy) The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.
member Tweet Definition of member Like Definition of member on Facebook
  1. One who officially belongs to a group.
  2. A limb.
  3. The penis.
  4. (logic) One of the propositions making up a syllogism.
  5. (settheory) An element of a set.
membrane Tweet Definition of membrane Like Definition of membrane on Facebook
noun (plural: membranes)
  1. A flexible enclosing or separating tissue forming a plane or film and separating two environments (usually in a plant or animal).
  1. A mechanical membrane, a thin, flat flexible part that can deform or vibrate when excited by an external force.
meninges Tweet Definition of meninges Like Definition of meninges on Facebook
noun (plural of meninx)
  1. (anatomy) The three membranes that envelop the brain and spinal cord.
meniscus Tweet Definition of meniscus Like Definition of meniscus on Facebook
noun (es, pl2=menisci)
  1. the curved surface of liquids in tubes, whether concave or convex, caused by the surface tension of the liquid
  2. a crescent or a body shaped like a crescent
  3. either of two parts of the human knee that provide structural integrity to the knee when it undergoes tension and torsion
mesencephalon Tweet Definition of mesencephalon Like Definition of mesencephalon on Facebook
  1. Composed of the tectum (dorsal portion) and the tegmentum (ventral portion), this part of the brain is located rostral to the pons and caudal to the thalamus and the basal ganglia.
mesoappendix Tweet Definition of mesoappendix Like Definition of mesoappendix on Facebook
noun (pl=mesoappendixes, pl2=mesoappendices)
  1. (anatomy) Part of the mesentery found near the appendix and the terminal ileum.
metacarpal Tweet Definition of metacarpal Like Definition of metacarpal on Facebook
  1. Any of the bones of the metacarpus.
  1. Of the metacarpus.
metacarpus Tweet Definition of metacarpus Like Definition of metacarpus on Facebook
noun (pl=metacarpi)
  1. (anatomy) The five bones that form intermediate part of the hand between the fingers and the wrist.
metatarsal Tweet Definition of metatarsal Like Definition of metatarsal on Facebook
  1. Any of the bones of the metatarsus.
  1. Of the metatarsus.
metatarsus Tweet Definition of metatarsus Like Definition of metatarsus on Facebook
noun (pluralmetatarsi)
  1. The five bones that form the intermediate part of the foot between the toes and the ankle.
midbrain Tweet Definition of midbrain Like Definition of midbrain on Facebook
  1. Composed of the tectum (dorsal portion) and the tegmentum (ventral portion), this part of the brain is located rostral to the pons and caudal to the thalamus and the basal ganglia.
middle finger Tweet Definition of middle finger Like Definition of middle finger on Facebook
  1. The finger between the forefinger and the ring finger. This is the longest finger.
midriff Tweet Definition of midriff Like Definition of midriff on Facebook
  1. The mid section of the human torso, from below the chest to above the waist
mons pubis Tweet Definition of mons pubis Like Definition of mons pubis on Facebook
  1. a fleshy protuberance over the pubic bones that becomes covered with hair during puberty
mons veneris Tweet Definition of mons veneris Like Definition of mons veneris on Facebook
  1. The female mons pubis
mouth Tweet Definition of mouth Like Definition of mouth on Facebook
  1. (anatomy) The opening of a creature through which food is ingested.
"Open your and say 'aah'," directed the doctor.
  1. The end of a river out of which water flows.
  2. An outlet, aperture or orifice.
The of a cave
  1. (slang) A loud or overly talkative person.
My kid sister is a real ; she never shuts up.
  1. (transitive) To speak about something.
He mouthed his opinions on the subject at the meeting.
  1. (transitive) To make the actions of speech, without producing sound.
The prompter mouthed the words to the actor, who had forgotten them.
  1. (transitive) To pick up or handle with the lips or mouth, but not chew or swallow.
The fish mouthed the lure, but didn't bite.
mucosa Tweet Definition of mucosa Like Definition of mucosa on Facebook
noun (pluralmucosae or mucosas)
  1. (anatomy) A mucous membrane.
mucous membrane Tweet Definition of mucous membrane Like Definition of mucous membrane on Facebook
noun (plural:mucous membranes)
  1. (anatomy) A membrane which secretes mucus. It forms the lining of various body passages that communicate with the air, such as the respiratory, genitourinary, and alimentary tracts including the mouth, nasal passages, vagina and urethra.
muscle Tweet Definition of muscle Like Definition of muscle on Facebook
  1. (uncountable) A contractile form of tissue which animals use to effect movement.
Muscle consists largely of actin and myosin filaments.
  1. (countable) An organ composed of muscle tissue.
The muscles in his legs strained under the load.
  1. (context, uncountable, figurative) Strength.
It took a lot of to move the boulders.
  1. (uncountable) Hired strongman, strongmen or bodyguards.
    • 1985 " w:Lance Parkin, Lance Parkin, The Infinity Doctors, p 34
    • :It was easy enough to dodge him, let him crash into the floorboards. Peltroc knew that his priority was the leader, not the hired .
verb (muscl, ing)
  1. To use force to make progress.
musculature Tweet Definition of musculature Like Definition of musculature on Facebook
  1. The collection of all muscles in a single body or in a single organ
  2. The structural configuration of muscle in a body or organ
myocardium Tweet Definition of myocardium Like Definition of myocardium on Facebook
noun (myocardia)
  1. (context, anatomy, cardiology) The muscles that surround and power the heart; blood is supplied by the coronary arteries.

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