Definition of "gibbous" [gib•bous]

• Characterized by convexity; protuberant. (adjective)
• More than half but less than fully illuminated. Used of the moon or a planet. (adjective)
• Having a hump; humpbacked. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "+Cap+ bright yellowish or orange color, 3 to 7 inches broad, convex, then flattened, gibbous, that is, more convex on one side than on the other; viscid, covered with woolly (floccose) scales, which often separate."
• "In one sense the likenesses were speaking -- that is, a gibbous balloon proceeded from the mouth of each figure, wherein the following dialogue was indicated."
• "Consider the following (from 'Ghost World') which not only features the only - in my knowledge - use of the word 'gibbous' in popular song, but rather beautifully captures a mood:"