nadir

名词 nadir:

1. an extreme state of adversity; the lowest point of anything
   同义词：low-water mark
2. the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected

na.dir

n.（名词）
Astronomy A point on the celestial sphere directly below the observer, diametrically opposite the zenith.
【天文学】 天底：天球上，在观测者垂直向下的一点，与天顶完全相对
The lowest point:
最低点：
例句：
the nadir of their fortunes.
他们最不景气的时候

来源：
Middle English
中古英语
from Medieval Latin
源自 中世纪拉丁语
from Arabic naYor (as-samt) [opposite (the zenith)]
源自 阿拉伯语 naYor (as-samt) [相反的（天顶）]