tropic
/ˈtrɔpɪk; `trɑpɪk/ n
1 [C usu sing 通常作单数]
line of latitude 2327 north (the tropic of Cancer) or south (the tropic of Capricorn) of the equator 回归线（北纬2327之北回归线称the tropic of Cancer, 南纬2327之南回归线称the tropic of Capricorn）. =>illus at globe 见globe插图.
2 the tropics [pl]
region between these two latitudes, with a hot climate 热带（地区）.