Webster's Revised Unabridged Dictionary · 1913

Gibbous

Gibbous , adjective

[Compare French gibbeux. See Gibbose.]

1.
Swelling by a regular curve or surface; protuberant; convex; as, the moon is gibbous between the half-moon and the full moon.
The bones will rise, and make a gibbous member. — Wiseman
2.
Hunched; hump-backed. [Obsolete] — Sir T. Browne