a tubular attachment used to keep stray light out of the lens of a camera
a transparent optical device used to converge or diverge transmitted light and to form images
biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses light on the retina
genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
(metaphor) a channel through which something can be seen or understood
(slang) a neighborhood
protective covering consisting of a metal part that covers the engine
