• synonyms


  1. any segmented worm of the phylum Annelida, including the earthworms, leeches, and various marine forms.
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  1. belonging or pertaining to the Annelida.
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Also an·nel·i·dan [uh-nel-i-dn] /əˈnɛl ɪ dn/.

Origin of annelid

First recorded in 1825–35; see origin at Annelida
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for annelid

Historical Examples

  • He isolated the first two blastomeres of the egg of Lanice, an Annelid.

    The Organism as a Whole

    Jacques Loeb

  • But in the annelid the mouth is on the second segment; here it is on the fourth.

  • They transformed the annelid parapodia into legs and developed wings.

  • Clitellum, kli-tel′um, n. the saddle of an annelid, as the earthworm:—pl.

  • Dohrn assumed also that the primitive Annelid ancestor must have possessed a notochord to give support in swimming.

    Form and Function

    E. S. (Edward Stuart) Russell

British Dictionary definitions for annelid


  1. any worms of the phylum Annelida, in which the body is divided into segments both externally and internally. The group includes the earthworms, lugworm, ragworm, and leeches
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  1. of, relating to, or belonging to the Annelida
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Derived Formsannelidan (əˈnɛlɪdən), noun, adjective

Word Origin

C19: from New Latin Annelida, from French annelés, literally: the ringed ones, from Old French annel ring, from Latin ānellus, from ānulus ring
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

Word Origin and History for annelid


"segmented worm," 1834, from French annélide, source of the phylum name Annelida, coined in Modern Latin 1801 by French naturalist J.B.P. Lamarck (1744-1829), from annelés "ringed ones" (from Latin anulus "little ring," a diminutive of anus; see anus) + Greek eidos "form, shape" (see -oid).

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Online Etymology Dictionary, © 2010 Douglas Harper

annelid in Science


  1. Any of various worms or wormlike animals of the phylum Annelida, characterized by an elongated, cylindrical body divided into ringlike segments. Most annelids have movable bristles called setae, and include earthworms, leeches, and polychetes (marine worms).
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.