a. (sb.) Ichth. [f. next + -AR1.] Designating a bone in the lower part of the operculum of a fish; pertaining to the suboperculum.
1854. Owen, in Orr’s Circ. Sci., Org. Nat., I. 178. [The operculum] consists of four bones; the one articulated to the tympanic pedicle is called ‘preopercular,’… the other three are, counting downwards, the ‘opercular,’… the ‘subopercular,’… the ‘interopercular.’
1897. Günther, in Mary Kingsley’s W. Africa, 699. Subopercular armature strong.
