a. and sb. Ichth. [f. mod.L. Triacanthus, generic name (f. Gr. τρι-, TRI- + ἅκανθα spine) + -OID.] a. adj. Belonging to or having the characters of the family Triacanthidæ of plectognath fishes, typified by the genus Triacanthus. b. sb. A fish of this family.
1891. in Cent. Dict.