(Frequently with distinguishing word) any of various North American orchids of the genus Malaxis (formerly Microstylis), typically having very small green or white flowers.
Origin
Mid 19th century.
Definition of adder's mouth in US English:
adder's mouth
(also addersmouth)
noun
North American
(Frequently with distinguishing word) any of various North American orchids of the genus Malaxis (formerly Microstylis), typically having very small green or white flowers.