First of the ten Heavenly Stems; used to indicate the first position in a sequence or rank, often equivalent to "A" or "I" in English lists; ancient Chinese compass point (75°)

(bound form) cyanogen; dicyanogen; a colorless, pungent, and highly toxic gas composed of carbon and nitrogen

(bound form) chrysanthemum; often refers to the 菊花 jú​huā plant

A type of organic compound formed by the reaction of an alcohol and an acid with the loss of water. Low molecular weight esters are typically fragrant liquids used as solvents or flavorings, while high molecular weight esters are solids or thick liquids found in fats and oils.