[ad-erz-tuhng] 
| 1. | a fern of the genus Ophioglossum, having one or sometimes two sterile leaves and a fruiting spike. |
| 2. | any of several American dogtooth violets. |
| 1. | Also called adder's-tongue, trout lily. any of several North American lilies of the genus Erythronium, having nodding flowers and usually mottled leaves. |
| 2. | a related Old World plant, E. dens-canis, having purplish flowers. |
| ad·der's-tongue (ād'ərz-tŭng') n.
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| adder's-tongue fern n. Any of various ferns in the genus Ophioglossum, having leaves divided into a simple, sterile blade and a slender, spikelike spore-bearing segment. Also called adder's-tongue. [From the resemblance of the spike at the base of the frond to a snake's tongue.] |
| dogtooth violet n. Any of several plants of the genus Erythronium, having leaves with reddish blotches and nodding, colorful, solitary, lilylike flowers on leafless stems. Also called adder's-tongue, trout lily. |