ancistroid

As adjectives the difference between ancistroid and crescent

is that ancistroid is hook-shaped while crescent is (dated|rare) marked by an increase; waxing, like the moon.

As a noun crescent is

the figure of the moon as it appears in its first or last quarter, with concave and convex edges terminating in points.

As a verb crescent is

to form into a crescent, or something resembling a crescent.

As a noun terms

is .

As an adjective ancistroid is

hook-shaped.