1. concave polygon

noun. A polygon such that there is a straight line that cuts it in four or more points.
Synonyms
polygon reentrant polygon polygonal shape reentering polygon
Antonyms
convex polygon concave polygon
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2. convexo-concave

adjective. Convex on one side and concave on the other with the convexity being greater than the concavity.
Synonyms
convex bulging
Antonyms
concave intrusive cupular

3. concavo-concave

adjective. Concave on both sides.
Synonyms
concave biconcave
Antonyms
convex protrusive gibbose

4. concave

adjective. (kɑːnˈkeɪv, ˈkɑːnkeɪv) Curving inward.
Synonyms
cupular planoconcave acetabular urn-shaped dished biconcave bursiform boat-shaped cupulate concavo-concave pouchlike saclike dish-shaped cuplike saucer-shaped recessed concavo-convex cotyloidal intrusive bowl-shaped umbilicate cotyloid patelliform pouch-shaped
Antonyms
protrusive convex solid unintrusive extrusive
Etymology
concave (English)
concavus (Latin)
cavus (Latin)
con- (Latin)
cum (Latin)

5. polygon

noun. (ˈpɑːlɪˌgɑːn) A closed plane figure bounded by straight sides.
Synonyms
trilateral heptagon decagon polygonal shape triangle isogon octagon dodecagon undecagon quadrilateral hexagon plane figure concave polygon trigon nonagon pentagon two-dimensional figure convex polygon spherical polygon quadrangle tetragon
Antonyms
concave polygon convex polygon oblique triangle right triangle unilateral
Etymology
polygon (English)
πολύγωνον (Ancient Greek (to 1453))
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