Pearl - definition of pearl by The Free Dictionary
pearl 1 (pûrl) n. 1. a. A smooth, lustrous, variously colored mass, chiefly of calcium carbonate, formed around a grain of sand or other foreign matter inside the shell of certain bivalve mollusks and valued as a gem. b. A bead resembling one of these masses. 2. Something small and spherical in shape: "pearls of sweat beading on her upper lip ...