a. [f. BI- pref.2 3 + TERNATE.] Doubly or subordinately ternate; see quot. 1870. Hence Biternately adv.
1794. Martyn, Rousseau’s Bot., xxi. 304.
1870. Bentley, Bot., 166. If the common petiole divides at its apex into 3 partial ones, each of which bears 3 leaflets, the leaf is termed biternate.
1870. Hooker, Stud. Flora, 167. Leaves biternately pinnate.
