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Webster 1913 Edition

Adj.

[Pref.

bi-

ternate

(Bot.)

Doubly ternate, as when a petiole has three ternate leaflets.

–

Bi-ter′nate-ly

adv.

Gray.

Adj.

[L. bis and ternus, three.] In botany, doubly ternate, as when a petiole has three ternate leaflets.

biternate ‎(not comparable)

Biternate leaves