noun
Moon; lunar
Classical or literary term for the Moon, often used in contrast with 太陽 (the Sun). In modern Japanese, 月 is the everyday word.
See also: 太陽
太陰暦は月の満ち欠けを基準にしている。
The lunar calendar is based on the phases of the Moon.
太陰と太陽は陰陽の象徴として扱われる。
The Moon and the Sun are treated as symbols of yin and yang.
noun
greater yin
In yin-yang philosophy, the greater yin, the extreme of yin, contrasted with 小陰 (lesser yin). A technical term used in traditional cosmology and medicine.
See also: 小陰
太陰は陰陽説で最も陰の性質が強い状態を指す。
In yin-yang theory, greater yin refers to the state with the strongest yin nature.
From Chinese 太陰 (tàiyīn), composed of 太 'great' and 陰 'yin, shade, moon'. The lunar sense is classical; the yin-yang sense is a technical philosophical term.