Concave

kon′kāv, adj. curved, vaulted, or arched, applied to the inner side of any curved line or rounded body, and opposed to convex , which is applied to the outside.— n. a hollow: an arch or vault.— adv. Con′cavely .— n. Concav′ity , the quality of being concave: the inner surface of a concave or hollow body.— adjs. Concā′vo-con′cave , or Doub′le-con′cave , concave on both sides of a lens; Concā′vo-con′vex , concave on one side, and convex on the other. [L. concavus , from con , inten., and cavus , hollow. See Cave .]