[{"Bold_text": "noun", "List Items": ["a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the convergence of light rays, as for magnification, or in correcting defects of vision.", "a combination of such pieces.", "some analogous device, as for affecting sound waves sound waves, electromagnetic radiation electromagnetic radiation,or streams of electrons.", "Anatomy. crystalline lens crystalline lens.", "Geology.a body of rock or that is thick in the middle and thinner toward the edges, similar in shape to a biconvex lens."]}, {"Bold_text": "verb (used with object)", "List Items": ["Movies.to film (a motion picture)."]}]