Definify.com

Webster 1913 Edition

‖

(jĭrˊȧ-kăn′thŭs)

Noun.

[NL., fr. Gr.

γυρόσ

round +

ἄκανθα

spine.]

(Paleon.)

A genus of fossil fishes, found in Devonian and carboniferous strata; – so named from their round, sculptured spines.