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All Words Glossary

Glossary of Zoology Terms
beginning with letter U
Browse the Zoology Glossary
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ulna Tweet Definition of ulna Like Definition of ulna on Facebook
noun (ulnae, pl2=ulnas)
  1. (anatomy) The postaxial bone of the forearm, or branchium, corresponding to the fibula of the hind limb.
umbo Tweet Definition of umbo Like Definition of umbo on Facebook
noun (pluralumbones or umbos)
  1. (Armor) The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
Quotations
  • 1786: It is thirteen inches diameter, made of wood covered with leather, and an iron plate decorated with nails and mouldings; the boss or umbo projects four inches. — Francis Grose, A Treatise on Ancient Armour and Weapons, page xii.
    1. A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larví¦ of echinoderms or in the tympanic membrane of the ear.
    2. (zoology) One of the lateral prominence just above the hinge of a bivalve shell.
underbelly Tweet Definition of underbelly Like Definition of underbelly on Facebook
noun (underbellies)
  1. (figuratively) The side which is not normally seen
The area by the canal is the underbelly of town - not something you'd see in the guidebooks
undergrowth Tweet Definition of undergrowth Like Definition of undergrowth on Facebook
noun
  1. those plants in a forest which only reach a relatively low height (such as shrubs and bushes)
ungulate Tweet Definition of ungulate Like Definition of ungulate on Facebook
noun
  1. an ungulate animal; a hooved animal
    The majority of large land mammals are ungulates.
adjective
  1. having hoof, hooves
urochord Tweet Definition of urochord Like Definition of urochord on Facebook
noun
  1. (biology) a notochord that is limited to the caudal region; especially in the Urochordata
    1. any marine organism of the Urochordata

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