tibouchina (?t?b??ka?n?; ?t?b??ki?n?) n (Animals) a member of the genus Tibouchina, which includes 350 species of shrubs found in South AmericaCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014