intestine (n.) Look up intestine at Dictionary.com
early 15c., from Middle French intestin (14c.) or directly from Latin intestinum "a gut," in plural, "intestines, bowels," noun use of neuter of adjective intestinus “inward, internal” (see intestines). Distinction of large and small intestines in Middle English was made under the terms gross and subtle. The word also was used as an adjective in English from 1530s with a sense of “internal, domestic, civil.”