O-pĕr'eu-late or O-pĕr'eu-lā'ted, a.

a. [Lat. operculatus, p. p. of operculare, to furnish with a lid, from operculum, q. v.; It. operculato, Fr. operculé.]

1. (Bot.) Closed by a lid or cover, as the capsules of the mosses.
2. (Ichth.) Having an operculum, or apparatus for protecting the gills; — said of fishes or their gills.