1. Curving inward
   "The concave mirror in the telescope focuses light to a single point"

See also: acetabular, biconcave, boat-shaped, bowl-shaped, bursiform, concavo-concave, concavo-convex, cotyloid, cotyloidal, cuplike, cupular, cupulate, dished, dish-shaped, intrusive, patelliform, planoconcave, pouchlike, pouch-shaped, recessed, saclike, saucer-shaped, umbilicate, urn-shaped

Antonym: bulging

Encyclopedia: Concave