Home › Words › L › lobelinelobelinelobeline · noun — A natural alkaloid found in various plants, mostly of the genus Lobelia, a white amorphous powder which is freely soluble in water, used as an aid to smoking cessation.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom translingual Lobelia + -ine.nounA natural alkaloid found in various plants, mostly of the genus Lobelia, a white amorphous powder which is freely soluble in water, used as an aid to smoking cessation.Definitions & examples from Wiktionary (CC BY-SA 3.0).