any of several North American, terrestrial orchids of the genus Malaxis, having tiny white or greenish flowers.
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British Dictionary definitions for adder's-mouth
any of various orchids of the genus Malaxis that occur in all parts of the world except Australia and New Zealand and have small usually greenish flowers: See also bog orchid
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