Definition of gibbous adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈɡɪbəs//
; NAmE NAmE//ˈɡɪbəs//
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(of the moon) with the bright part bigger than a semicircle and smaller than a circle Word Origin late Middle English: from late Latin gibbosus, from Latin gibbus ‘hump’.
See the Oxford Advanced American Dictionary entry: gibbous