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|Noun||1.||concave shape - a shape that curves or bends inward|
solid - a three-dimensional shape
dome - a concave shape whose distinguishing characteristic is that the concavity faces downward
imprint, impression, depression - a concavity in a surface produced by pressing; "he left the impression of his fingers in the soft mud"
cup - any cup-shaped concavity; "bees filled the waxen cups with honey"; "he wore a jock strap with a metal cup"; "the cup of her bra"