Google Tag Manager (noscript) End Google Tag Manager (noscript) SINCE 1828 GAMES & QUIZZES THESAURUS WORD OF THE DAY FEATURES SHOP Buying Guide M-W Books LOG IN REGISTER settings log out MY WORDS MY WORDS dictionary thesaurus view recents Log in Sign Up Hello, Games & Quizzes Thesaurus Word of the Day Features Buying Guide M-W Books My Words My Words View Recents Account Log Out noun Save to list Button Save Word lu·​pine | \ ˈlü-pən \ variants: or less commonly lupin lupine (Entry 1 of 2) : any of a genus ( Lupinus ) of leguminous herbs including some poisonous forms and others cultivated for their long showy racemes of usually blue, purple, white, or yellow flowers or for green manure, fodd...