placoderms
/P L EY1 K AH0 D ER0 M Z/noun
- 1
A member of an extinct class (Placodermi) of jawed fish with armored heads and thoraces; the group lived during the Silurian and Devonian periods.
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Source: https://en.wiktionary.org/wiki/placoderm, https://en.wiktionary.org/wiki/placoderms