yohimbe (j???h?mbe?) n1. (Plants) a rubiaceous tree native to W Africa2. (Complementary Medicine) a natural remedy derived from the bark of this tree, used to treat male impotenceCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014yo?him?be (yo??h?m be?, -bi) n., pl. -bes. a tropical W African tree, Corynanthe johimbe, of the madder family, yielding an alkaloid formerly used as an aphrodisiac. [(