[mod.L., f. sub- SUB- 2 b (a) + OPERCULUM.]

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  1.  Ichth. The bone situated below the operculum in the gill-cover of a fish.

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1834.  McMurtrie, Cuvier’s Anim. Kingd., 191. A sort of lid, composed of three bony pieces, the operculum, the sub[o]perculum, and the interoperculum.

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1878.  Bell, trans. Gegenbaur’s Comp. Anat., 455. Behind the preoperculum is the suboperculum.

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1888.  Rolleston & Jackson, Anim. Life, 93.

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  2.  Anat. The part of an occipital orbital gyre which overlies the insula of Reil.

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1889.  Buck’s Handbk. Med. Sci., VIII. 160/2. The insula … becomes a subgyre, while the operculum, preoperculum, suboperculum, and postoperculum are supergyres.

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  Hence Suboperculiform a., of the form of a suboperculum.

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1852.  Dana, Crust., I. 569. The outer maxillipeds are suboperculiform.

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