concave

Synonyms:

intrusive

thrusting inward

acetabular, cotyloid, cotyloidal

of the cup-shaped socket that receives the head of the thigh bone

biconcave, concavo-concave

concave on both sides

boat-shaped

having a concave shape like a boat

bowl-shaped

having a concave shape with an open top like a bowl

bursiform, pouch-shaped, pouchlike, saclike

shaped like a pouch

concavo-convex

concave on one side and convex on the other with the concavity being greater than the convexity

cuplike

resembling the shape of a cup

cupular, cupulate

shaped like (or supporting) a cupule

dish-shaped, dished, patelliform

shaped like a dish or pan

planoconcave

flat on one side and concave on the other

recessed

resembling an alcove

saucer-shaped

having a concave shape like a saucer

umbilicate

depressed like a navel

urn-shaped

having a concave shape like an urn

Antonyms:

convex

curving or bulging outward

bulging

protrusive

thrusting outward

bell-shaped

having a convex shape that resembles a bell

biconvex, convexo-convex, lenticular, lentiform

convex on both sides; shaped like a lentil

broken-backed, hogged

(of a ship) so weakened as to sag at each end

convexo-concave

convex on one side and concave on the other with the convexity being greater than the concavity

gibbose, gibbous

(used of the moon) more than half full

helmet-shaped

having the convex shape of a helmet

planoconvex

flat on one side and convex on the other

umbel-like, umbellate

resembling an umbel in form

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