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epiphragm

[ep-uh-fram]
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noun
  1. a calcified or membranous septum produced by certain land snails during hibernation and functioning to cover the shell opening and prevent desiccation.
  2. Botany. a membrane enclosing the capsule in certain mosses.
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Origin of epiphragm

1820–30; < Greek epíphragma covering, lid, equivalent to epi- epi- + phrágma fence
Related formsep·i·phrag·mal [ep-uh-frag-muh l] /ˌɛp əˈfræg məl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for epiphragm

epiphragm

noun
  1. a disc of calcium phosphate and mucilage secreted by snails over the aperture of their shells before hibernation
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Word Origin

C19: via New Latin from Greek epiphragma a lid, from epiphrassein, from epi- + phrassein to place in an enclosure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012