concave shape

1. A shape that curves or bends inward (synset 113887586)
   is a type of: solid - a three-dimensional shape
   subtypes:

   • dome - a concave shape whose distinguishing characteristic is that the concavity faces downward
   • fossa, pit - a concavity in a surface (especially an anatomical depression)
   • corner, niche, recess, recession - a small concavity
   • bowl, trough - a concave shape with an open top
   • pocket, scoop - a hollow concave shape made by removing something
   • depression, impression, imprint - a concavity in a surface produced by pressing
   • cup - any cup-shaped concavity
   • indentation, indenture - a concave cut into a surface or edge (as in a coastline)
   same as: concavity, incurvation, incurvature

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