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ostracod

os·tra·cod [ óstrə kòd ] (plural os·tra·cod or os·tra·cods)


noun 
Definition:
 
small crustacean: a tiny crustacean that lives inside a hard outer shell made of two hinged halves. Subclass Ostracoda.

[Mid-19th century. < modern Latin Ostracoda< Greek ostrakōdēs "like a pottery fragment" < ostrakon "shell"]
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