any of various orchids, especially of the genera Listera and Liparis, characterized by two nearly opposite broad leaves.
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British Dictionary definitions for twayblade
any terrestrial orchid of the genus Listera, having a basal pair of oval unstalked leaves arranged opposite each other
any of various other orchids with paired basal leaves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012