Definition of platysomid in US English:

platysomid

adjective

  • Of, belonging to, or characteristic of the extinct family Platysomidae of palaeoniscoid fishes, known from fossil remains of the Carboniferous, Permian, and Triassic periods, and generally having a deep, vertically flattened body.

noun

  • A fish of the family Platysomidae.

Origin

Late 19th century; earliest use found in American Naturalist. From scientific Latin Platysomidae, family name from Platysomus, genus name + -idae.

Pronunciation

platysomid

/ˌplatɪˈsəʊmɪd/