placoderm
(noun) fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws
Source: WordNet® 3.1
placoderm (plural placoderms)
(palaeontology) A member of an extinct class (Placodermi) of jawed fish with armored heads and thoraces; the group lived during the Silurian and Devonian periods. [from 19th c.]
placoderm (comparative more placoderm, superlative most placoderm)
(palaeontology) Pertaining to the class Placodermi. [from 19th c.]
• proclamed
Source: Wiktionary
Plac"o*derm, n. Etym: [Gr. (Paleon.)
Definition: One of the Placodermi.
Source: Webster’s Unabridged Dictionary 1913 Edition
25 November 2024
(noun) infestation with slender threadlike roundworms (filaria) deposited under the skin by the bite of black fleas; when the eyes are involved it can result in blindness; common in Africa and tropical America
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