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From The Collaborative International Dictionary of English v.0.48:
Operculate \O*per"cu*late\, Operculated \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. [1913 Webster] 2. (Zool.) Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes. [1913 Webster]