a transparent optical device used to converge or diverge transmitted light and to form images | 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 |
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons | (music) an electronic simulation of a pipe organ |
biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina | a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows |
(metaphor) a channel through which something can be seen or understood | a fully differentiated structural and functional unit in an animal that is specialized for some particular function |
| a periodical that is published by a special interest group |
| a government agency or instrument devoted to the performance of some specific function |