curved
curving
Cynthian
S-shaped
bicorn
corniform
crescent
crescent-shaped
crescentic
crescentiform
crescentlike
falcate
falciform
horn-shaped
horned
lunar
lunate
luniform
lunular
menisciform
meniscoid
moon-shaped
moonlike
semilunar
sickle-like
sickle-shaped
sigmoid
two-horned
cavernous
circular
concave
concentric
elliptical
hexagonal
horizontal
jagged
north
octagonal
outer
perpendicular
pillared
quadrangular
rocky