S: (n) lens, crystalline lens, lens of the eye (biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina)
S: (n) gland, secretory organ, secretor, secreter (any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream)
S: (n) organ (a government agency or instrument devoted to the performance of some specific function) "The Census Bureau is an organ of the Commerce Department"
S: (n) organ, pipe organ (wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard)