a. [ See Lupine, n. ] Wolfish; ravenous. Gauden. [ 1913 Webster ]

n. [ L. lupinus, lupinum, apparently fr. lupinus belonging to a wolf, fr. lupus a wolf; perh. so called because it was supposed to exhaust the soil: cf. F. lupin. Cf. Wolf. ] (Bot.) A leguminous plant of the genus Lupinus, especially Lupinus albus, the seeds of which have been used for food from ancient times. The common species of the Eastern United States is Lupinus perennis. There are many species in California. [ 1913 Webster ]

n. (Chem.) A glucoside found in the seeds of several species of lupine, and extracted as a yellowish white crystalline substance. [ 1913 Webster ]

n. (Chem.) An alkaloid found in several species of lupine (Lupinus luteus, Lupinus albus, etc.), and extracted as a bitter crystalline substance, having a formula C10H19NO. Called also l-lupinine [ 1913 Webster ]

Chemically it is a a bicyclic saturated quinolizine [ 1-R-trans ]-Octahydro-2H-quinolizine-1-methanol, with the structure:
CH2OH | /\ H /\ / \|/ \ | | | | N | \ / \ / \/ \/
[ MI11 ] [ PJC ]