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Glossary of Invertebrates Terms
beginning with letter O
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ocellus Tweet Definition of ocellus Like Definition of ocellus on Facebook
noun (ocelli)
  1. A simple eye consisting of a single lens and a small number of sensory cells
  2. An eyelike marking in the form of a spot or ring of colour, as on the wing of a butterfly or the tail of a peacock
octopus Tweet Definition of octopus Like Definition of octopus on Facebook
noun (pl=octopuses, pl2=octopi, pl3=octopodes) (see usage note regarding plurals)
  1. Any of several marine molluscs/mollusks, of the family Octopodidae, having no internal or external protective shell or bone (unlike the nautilus, squid or cuttlefish) and eight arms each covered with suckers.
  2. (uncountable) Any of these marine molluscs eaten as food.
  3. (context, by extension) An organization that has many powerful branches controlled from the centre.
oligochaete Tweet Definition of oligochaete Like Definition of oligochaete on Facebook
noun
  1. any of various hermaphroditic aquatic and terrestrial annelid worms, of the class Oligochaeta, that have single bristles along the body
ophiuroid Tweet Definition of ophiuroid Like Definition of ophiuroid on Facebook
noun
  1. the brittle star
oyster Tweet Definition of oyster Like Definition of oyster on Facebook
noun
  1. Any marine bivalve mollusk of the Family Ostreidae, usually found adhering to rocks or other fixed objects in shallow water along the seacoasts, or in brackish water in the mouth of rivers.
  2. A name popularly given to the delicate morsel of dark meat contained in a small cavity of the bone on each side of the lower part of the back of a fowl.
  3. (color) a pale beige colour tinted with grey or pink, like that of an oyster.
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  1. DADFB7" width="80">&nbsp; </td></tr></table>
    1. (slang) A person who keeps the secrets trusted to him,
adjective
  1. (color) of a pale beige colour tinted with grey or pink, like that of an oyster.

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