A small room in which a prisoner is locked up or in which a monk or nun sleeps. The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic. A small group forming a nucleus of political activity, typically a secret, subversive one. The local area covered by one of the short-range transmitters in a cellular telephone system. A device containing electrodes immersed in an electrolyte, used for current-generation or electrolysis.