anaspid

[uh-nas-pid]

an·as·pid

[uh-nas-pid]
noun Paleontology.
any member of an extinct order, Anaspida, of small, freshwater jawless fishes of the Silurian and Devonian periods, characterized by a single nostril, narrow rows of scales, and, usually, an armor-plated head.

Origin:
< Neo-Latin Anaspida name of the order, equivalent to an- an-3 + Greek aspid- (stem of aspís shield) + -a neuter plural noun ending
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Anaspid is always a great word to know.
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the offspring of a zebra and a donkey.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
WordNet
anaspid

noun
extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian 
WordNet® 3.0, © 2006 by Princeton University.
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