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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: botany) Closed by a lid or cover, as the capsules of the mosses.

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

Origin: L. Operculatus, p.p. Of operculare to furnish with a lid, fr. Operculum lid.