{ O*per"cu*late (?), O*per"cu*la`ted (?), } a. [L. operculatus, p. p. of operculare to furnish with a lid, fr. operculum lid.] 1. (Bot.) Closed by a lid or cover, as the capsules of the mosses.

2. (Zoöl.) Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes.