tway·blade /ˈtweˌbled/
Tway·blade n. Bot. Any one of several orchidaceous plants which have only two leaves, as the species of Listera and of Liparis. [Written also twyblade.]
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twayblade
n 1: orchid having a pair of ovate leaves and a long slender
raceme of green flowers sometimes tinged red-brown;
Europe to central Asia [syn: Listera ovata]
2: an orchid of the genus Liparis having a pair of leaves