Obs. Herb. [ad. med.L. bifolium, f. bi- two + folium leaf; cf. trefoil, cinquefoil.] Obs. name of the Twayblade (Listera ovata).
1633. Gerard, Herbal., II. lxxxvii. 402. Of Twayblade, or herbe Bifoile.
1860. Mayne, Med. Lex., 121.
