nitrous acid (HNO2); a light-blue chemical solution often used as a reducing agent in industry

(bound form) different; not the same; diverse

the fifth of the ten Heavenly Stems; also used to represent the fifth in a series, such as the letter 'E' or the Roman numeral 'V'

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.