Meaning

adjective characteristic of or suffering from kyphosis, an abnormality of the vertebral column

adjective (used of the moon) more than half full

originFrom Middle English gibbous, from Latin gibbus (“humped, hunched”), probably cognate with cubō (“bend oneself, lie down”), Italian gobba (“humpback”), Ancient Greek κῡφός (kūphós, “humpback, bent”), κύβος (kúbos, “cube, vertebra”), Spanish giboso (“humped”). Also ultimately compare dialectal Norwegian keiv (“slanted, wrong”), German schief (“crooked, slanting”) and Dutch scheef (“crooked,…

Etymology from Wiktionary, CC BY-SA 3.0