adder's-tongue

[ ad-erz-tuhng ]
/ ˈæd ərzˌtʌŋ /

noun

a fern of the genus Ophioglossum, having one or sometimes two sterile leaves and a fruiting spike.
any of several American dogtooth violets.

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British Dictionary definitions for adder's-tongue

adder's-tongue

noun

any of several terrestrial ferns of the genus Ophioglossum, esp O. vulgatum, that grow in the N hemisphere and have a spore-bearing body that sticks out like a spike from the leaf: family Ophioglossaceae
another name for dogtooth violet
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