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concave

Concave describes an inward curve; its opposite, convex, describes a curve that bulges outward. They are used to describe gentle, subtle curves, like the kinds found in mirrors or lenses.

A valley is a concave curve, a mountain is a convex curve—you can remember this by thinking that things that vex you tend to stick out, and that caves tend to be holes that go in, like valleys or innie belly buttons. If you want to describe a bowl, you might say there is a large blue spot on the center of the concave side.

Definitions of concave
  1. adjective
    curving inward
    Synonyms:
    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
    intrusive
    thrusting inward
    see moresee less
    Antonyms:
    bulging, convex
    curving or bulging 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
    protrusive
    thrusting outward
    show more antonyms...
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