n.[天] 天底，最底点，最低点

英文释义

n. That point of the heavens, or lower hemisphere, directly opposite the zenith; the inferior pole of the horizon; the point of the celestial sphere directly under the place where we stand.

n. The lowest point; the time of greatest depression.

词干

nadir 最低点
→ 来自阿拉伯语nazir，相反的，来自nazir as-samt，反方向的，与天顶相反的底点，词源同zenith.后引申词义最低点。