Obs. [f. THREE + LEAF: cf. TREFOIL.] A three-leaved or trifoliate plant. a. The wood-sorrel; so called from its ternate leaves. b. A species of orchid (? Habenaria) with three root-leaves.
c. 1000. Ælfric, Voc., in Wr.-Wülcker, 133/22. Trifolium, ʓeacessure, uel þrilefe.
1562. Turner, Herbal, II. 128. Satyrion whiche som call Threleafe, because it hath thre leaues, bowing doune toward the earth.
