epidendrum (??p??d?ndr?m) or epidendronen (Botany) an orchid belonging to the Epidendrum genusCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ep?i?den?drum (??p ??d?n dr?m) n. any of numerous tropical American orchids of the genus Epidendrum. [1785?95;