Astronomy. (of a heavenly body) convex at both edges, as the moon when more than half full.
- Also gib·bose [gib-ohs]. /ˈgɪb oʊs/.
- gib·bous·ly, gib·bose·ly, adverb
- gib·bous·ness, gib·bose·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use gibbous in a sentence
The gibbous moon still hangs in the sky and casts a feeble light over the scene.Little Rivers | Henry van Dyke
Now he softly opened the sash, and the radiance of a gibbous moon riding in the opposite sky flooded the apartment.A Laodicean | Thomas Hardy
The ventral margin is sometimes straight and sometimes quite gibbous.
Valve gibbous in the middle, with rounded ends; central area elliptical.
Valve strongly gibbous in the middle; ends rounded; stri, 12-13 in 10 .
British Dictionary definitions for gibbous
(of the moon or a planet) more than half but less than fully illuminated
having a hunchback; hunchbacked
- gibbously, adverb
- gibbousness, noun
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
Scientific definitions for gibbous
More than half but less than fully illuminated. Used to describe the Moon or a planet. Compare crescent.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.