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osculum

[os-kyuh-luh m]
noun, plural os·cu·la [os-kyuh-luh] /ˈɒs kyə lə/.
  1. a small mouthlike aperture, as of a sponge.
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Origin of osculum

1605–15; < New Latin, Latin ōsculum, equivalent to ōs mouth + -culum -cule1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for osculum

osculum

noun plural -la (-lə)
  1. zoology a mouthlike aperture, esp the opening in a sponge out of which water passes
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Word Origin

C17: from Latin: a kiss, little mouth, diminutive of ōs mouth
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

osculum in Medicine

osculum

(ŏskyə-ləm)
n. pl. os•cu•la (-lə)
  1. A pore or minute opening.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.