any extinct bony-plated fishlike vertebrate of the class Placodermi, of Silurian to Permian times: thought to have been the earliest vertebrates with jaws
Word origin
C19: from Greek plac-, plax a flat plate + -derm
Examples of 'placoderm' in a sentence
placoderm
However, the overall morphology and histology seems to be similar to the structure of placoderm dermal plates.
Anna Jerve, Qingming Qu, Sophie Sanchez, Henning Blom, Per Erik Ahlberg 2016, 'Three-dimensional paleohistology of the scale and median fin spine of Lophosteus superbus(Pander 1856)', PeerJhttps://peerj.com/articles/2521.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)