乙亥 yǐhài year 12 Definitions Defs Origin Strokes Stroke Words Sentences Sents 乙 yǐ second Heavenly Stem The second of the ten Heavenly Stems亥 hài 12th Earthly Branch the last of the twelve Earthly Branches, associated with the year of the Boar; used to represent the twelfth position in an ordered sequence