noun a fully differentiated structural and functional unit in an animal that is specialized for some particular function.
noun a government agency or instrument devoted to the performance of some specific function.
noun (music) an electronic simulation of a pipe organ.
— synonyms: electric_organ, electronic_organ, Hammond_organ
noun a periodical that is published by a special interest group.
noun 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.
— synonyms: pipe_organ
noun a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows.
— synonyms: harmonium, reed_organ