乙丑 yǐchǒu second year Origin Definitions Defs Strokes Stroke Words Sentences Sents 乙 yǐ second Heavenly Stem The second of the ten Heavenly Stems丑 chǒu [Earthly Branch] the second of the twelve Earthly Branches, associated with the ox; also refers to the time from 1 a.m. to 3 a.m.