Webster’s Revised Unabridged Dictionary · 1913
Convallamarin
Con·val′la·ma′rin (kŏn·văl′lȧ·mā′rĭn), n. [Convallaria + L. amarus bitter.] (Chem.) A white, crystalline, poisonous substance, regarded as a glucoside, extracted from the lily of the valley (Convallaria Majalis). Its taste is first bitter, then sweet.