n. In archœol., a small underground passage; specifically, one of the underground drains which formed a close network throughout the Roman Campagna and certain other districts of Italy.n. [capitalized] [NL.] A genus of lemmings, of the family Muridœ and subfamily Arvicolinœ: so called because the animals some what resemble small rabbits.n. In medicine, a burrow of an itch-insectin the skin.