noun
placoderms
Extinct class of armored prehistoric fish. Used in paleontology and biology contexts.
板皮魚類は古生代に繁栄した魚の一群である。
Placoderms are a group of fish that flourished during the Paleozoic era.
The term is composed of 板皮 (plate skin) and 魚類 (fish class), referring to the armored plates characteristic of placoderms. The exact historical derivation is uncertain.