• Webster's Revised Unabridged Dictionary
    • n Epiphragm (Zoöl) A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or estivation.
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Century Dictionary and Cyclopedia
    • n epiphragm In botany: The disk-like apex of the columella of Polytricheæ, which extends over the mouth of the capsule below the operculum.
    • n epiphragm A delicate membrane closing the cup-like receptacle of the Nidulariacei.
    • n epiphragm In conchology, the plate of hardened mucus secreted by a gastropod, as a snail, to plug up or seal the opening of the shell during hibernation; a sort of temporary or false operculum, sometimes hardened by calcareous deposit. See clausilium.
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Chambers's Twentieth Century Dictionary
    • n Epiphragm ep′i-fram (bot.) the dilated apex of the columella in urn-mosses: the disc with which certain molluscs close the aperture of their shell.
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Webster's Revised Unabridged Dictionary
Gr. a covering, lid, fr. to block up