is.thmus 5IsW7mEs, 5Is- n [C] a narrow piece of land with water on each side which joins two larger areas of land 地峡 the Isthmus of Panama 巴拿马地峡 the Isthmus of Suez 苏伊士地峡 The north and south of the island are linked by a narrow isthmus. 岛的北部和南部由一条狭窄的地峡相连。