[¦ī·sə‚prō·pə′nal·ə‚mēn] (organic chemistry) CH3CH(OH)CH2NH2 A combustible liquid with a faint ammonia odor and a boiling point of 159.9°C; soluble in water; used as an emulsifying agent and for dry-cleaning soaps, wax removers, cosmetics, plasticizers, and insecticides.