Gyracanthus \Gyr`a*can"thus\ (j[i^]r`[.a]*k[a^]n"th[u^]s), n.
[NL., fr. Gr. gyro`s round + 'a`kanqa spine.] (Paleon.)
A genus of fossil fishes, found in Devonian and carboniferous
strata; -- so named from their round, sculptured spines.
[1913 Webster]