Either of the two imaginary circles around the earth parallel to the equator, at a distance of 2327' north and south of it, called tropic of Cancer and tropic of Capricorn respectively, marking the limits of the torrid zone.

回归线(地球上与赤道平行之二圈假想线，一在北纬二十三度二十七，是为北回归线，一在南纬二十三度二十七分，是为南回归线)。

The region on the earth lying between these two circles.

热带(两回归线间之区域)。

Pertaining to the region between the tropics of Cancer and Capricorn.

热带的；热带地方的。