isthmus
isth.mus \'is-m*s\ n [L, fr. Gk isthmos] 1: a narrow strip of land connecting two larger land areas 2: a contracted anatomical part or passage connecting two larger structures or cavities
Webster's English Dictionaryisth.mus \'is-m*s\ n [L, fr. Gk isthmos] 1: a narrow strip of land connecting two larger land areas 2: a contracted anatomical part or passage connecting two larger structures or cavities