noun
Wood Ox
The 2nd term of the traditional sexagenary cycle (干支), combining the Heavenly Stem 乙 (きのと, Wood) and the Earthly Branch 丑 (うし, Ox). Used in East Asian calendars and astrology; corresponds to years such as 1925, 1985, 2045.
See also: 干支
乙丑の年は、十干十二支の2番目にあたります。
The year of the Wood Ox is the second in the sexagenary cycle.
干支 is the general term for the sexagenary cycle; 乙丑 is one specific term within that cycle.
From the combination of the Heavenly Stem 乙 (きのと, 'Wood') and the Earthly Branch 丑 (うし, 'Ox'). The reading きのとうし is the native Japanese (kun) reading; いっちゅう and おっちゅう are Sino-Japanese (on) readings.