concave
adjectiveDefinition of concave
(Entry 1 of 2)
1
: hollowed or rounded inward like the inside of a bowl
a concave lens
2
: arched in : curving in
—used of the side of a curve or surface on which neighboring normals to the curve or surface converge and on which lies the chord joining two neighboring points of the curve or surface
concave
nounDefinition of concave (Entry 2 of 2)
: a concave line or surface
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