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See more synonyms for annular on Thesaurus.com
  1. having the form of a ring.
  2. (of a carpenter's nail) having a series of concentric grooves to improve holding power.
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Origin of annular

1565–75; < Latin annulāris, equivalent to annul(us) ring (variant of ānulus) + -āris -ar1
Related formsan·nu·lar·i·ty, nounan·nu·lar·ly, adverbin·ter·an·nu·lar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for annular

Historical Examples

British Dictionary definitions for annular


  1. ring-shaped; of or forming a ring
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Derived Formsannularity (ˌænjʊˈlærɪtɪ), nounannularly, adverb

Word Origin

C16: from Latin annulāris, from annulus, 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 annular


"ring-shaped," 1570s, from French annulaire (16c.) or directly from Latin annularis "pertaining to a ring," from annulus, diminutive of anus "ring" (see anus). An annular eclipse (1727) is one in which the dark body of the moon is smaller than the disk of the sun, so that at the height of it the sun appears as a ring of light. Related: Annularity.

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Online Etymology Dictionary, © 2010 Douglas Harper

annular in Medicine


  1. Shaped like or forming a ring.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

annular in Science


  1. Forming or shaped like a ring.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.