Pronunciation: (kō'lēn, kol'ēn),[key] —n. 1. Biochem.a quaternary ammonium cation, C5H14N+O, one of the B-complex vitamins, found in the lecithin of many plants and animals.
2. choline hydroxide, C5H15NO2, the viscous, strongly alkaline commercial form of this compound, usually synthesized, used as a feed supplement, esp. for poultry, and in medicine in certain liver conditions.
3. choline chloride, C5H14ClNO.