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[noo-duh-brangk, nyoo-]
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  1. a shell-less, marine snail of the suborder Nudibranchia, having external, often branched respiratory appendages on the back and sides.

Origin of nudibranch

1835–45; < French nudibranche, equivalent to nudi- nudi- + branche gill (< Latin branchia branchia)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for nudibranch

Historical Examples

  • Ancylodoris, the only fresh-water Nudibranch, from Lake Baikal.

    Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5


  • Flat against the stone and not easily perceived may be a chiton, a planarian worm, or a nudibranch.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

  • In Doris we find a quite different type of nudibranch from that presented by the two genera Dendronotus and olis.

    The Sea-beach at Ebb-tide

    Augusta Foote Arnold

British Dictionary definitions for nudibranch


  1. any marine gastropod of the order Nudibranchia, characterized by a shell-less, often beautifully coloured, body bearing external gills and other appendagesAlso called: sea slug

Word Origin

C19: from nudi- + branche, from Latin branchia gills
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

nudibranch in Science


  1. See sea slug.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.