Waning gibbous, 79% visible [View all]

[elleng]

“Gibbous” means “convex, rounded, protuberant.” The OED says “gibbous” was first applied to the moon in 1690, though it came into English more than 200 years earlier. So we can have a “waxing gibbous moon” and a “waning gibbous moon,” though we see those terms outside of astronomical contexts only once in a blue moon.