curved
curving
falcated
Cynthian
S-shaped
bicorn
corniform
crescent
crescent-shaped
crescentic
crescentiform
crescentlike
curve
falciform
horn-shaped
horned
lunar
lunate
luniform
lunular
menisciform
meniscoid
moon-shaped
moonlike
semicircular
semilunar
sickle-like
sickle-shaped
sigmoid
two-horned
defalcate