Astronomy. (of a heavenly body) convex at both edges, as the moon when more than half full. See diag. under moon.
Also, gibbose [gib-ohs] .

1350–1400; Middle English < Latin gibbōsus humped, equivalent to gibb(a) hump + -ōsus -ous

gibbously, gibbosely, adverb
gibbousness, gibboseness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gibbous or gibbose (ˈɡɪbəs, ˈɡɪbəʊs)
1.  (of the moon or a planet) more than half but less than fully illuminated
2.  having a hunchback; hunchbacked
3.  bulging
[C17: from Late Latin gibbōsus humpbacked, from Latin gibba hump]
gibbose or gibbose
[C17: from Late Latin gibbōsus humpbacked, from Latin gibba hump]
'gibbously or gibbose
'gibbousness or gibbose

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1400, from L.L. gibbous "hunchbacked," from L. gibbus "hump, hunch," of uncertain origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

gibbous gib·bous (gĭb'əs)

  1. Characterized by convexity; protuberant.

  2. Having a hump; humpbacked.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
gibbous   (gĭb'əs)  Pronunciation Key 
More than half but less than fully illuminated. Used to describe the Moon or a planet. Compare crescent.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sometimes it's a waning gibbous phase, low in the west at sunrise.
Most noticeable are the half-moon and football-shaped gibbous moon, phases separated by two or three days.
The crescent and gibbous phases happen in between those times.
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