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The operculum, meaning little lid, (plural: opercula or operculums) is a corneous or calcareous anatomical structure which exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails. In other words, this structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc.
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[.adj]: سرپوش دار ، دردار
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\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.
2. (zo?l.) having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes.
adj : having an operculum [syn: operculated]
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