1. (a.) Swelling by a regular curve or surface; protuberant; convex; as, the moon is gibbous between the half-moon and the full moon.

2. (a.) Hunched; hump-backed.

arched arciform arclike arcual bandy bowed bowlike bunchbacked camelback concave convex convexed crookbacked embowed excurvate excurvated excurved gibbose humpbacked humped humpy hunchbacked hunched hunchy kyphotic out-bowed oxbow rotund vaulted