• synonyms


[gib-uh s]
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  1. Astronomy. (of a heavenly body) convex at both edges, as the moon when more than half full.
  2. humpbacked.
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Also gib·bose [gib-ohs] /ˈgɪb oʊs/.

Origin of gibbous

1350–1400; Middle English < Latin gibbōsus humped, equivalent to gibb(a) hump + -ōsus -ous
Related formsgib·bous·ly, gib·bose·ly, adverbgib·bous·ness, gib·bose·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for gibbous

convex, jutting, beetling, protruding, bent, leaning, bulging, awry, crooked, unbalanced, unequal, disproportional, gibbous, unsymmetrical, protuberant, conspicuous, prominent, proud, salient, prognathous

Examples from the Web for gibbous

Historical Examples of gibbous

British Dictionary definitions for gibbous


gibbose (ˈɡɪbəʊs)

  1. (of the moon or a planet) more than half but less than fully illuminated
  2. having a hunchback; hunchbacked
  3. bulging
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Derived Formsgibbously, adverbgibbousness, noun

Word Origin for gibbous

C17: from Late Latin gibbōsus humpbacked, from Latin gibba hump
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 gibbous


c.1400, "bulging, convex," from Late Latin gibbus "hunchbacked," from Latin gibbus "hump, hunch," of uncertain origin. Of the moon from early 15c.; also used from 15c. of hunchbacks.

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Online Etymology Dictionary, © 2010 Douglas Harper

gibbous in Medicine


  1. Characterized by convexity; protuberant.
  2. Having a hump; humpbacked.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

gibbous in Science


  1. More than half but less than fully illuminated. Used to describe the Moon or a planet. Compare crescent.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.