adj. 1. (Bot.) pinnate with a pair of leaflets at the apex, i.e. without an odd leaflet, or other appendage, at the end; -- said of a leaf shape
Syn. -- even-pinnate, paripinnate [ 1913 Webster + WordNet 1.5 ]

{ } a. [ Pref. bi- + pinnate; cf. F. bipinné. Cf. Bipennate. ] Twice pinnate. [ 1913 Webster ]

a. [ L. impar unequal + E. pinnate. ] (Bot.) Pinnate with a single terminal leaflet. [ 1913 Webster ]

adj. (Bot.) Pinnate with a single leaflet at the apex; -- of a leaf shape.
Syn. -- imparipinnate. [ WordNet 1.5 ]

a. [ Pari- + pinnate. ] (Bot.) Pinnate with an equal number of leaflets on each side; having no odd leaflet at the end. [ 1913 Webster ]

{ } a. [ L. pinnatus feathered, fr. pinna a feather. See Pin a peg, Pen feather. ] 1. (Bot.) Consisting of several leaflets, or separate portions, arranged on each side of a common petiole, as the leaves of a rosebush, a hickory, or an ash. See Abruptly pinnate, and Illust., under Abruptly. [ 1913 Webster ]

2. (Zool.) Having a winglike tuft of long feathers on each side of the neck. [ 1913 Webster ]

Pinnated grouse (Zool.), the prairie chicken. [ 1913 Webster ]

adv. In a pinnate manner. [ 1913 Webster ]

a. [ Pref. tri- + pinnate. ] (Bot.) Having bipinnate leaflets arranged on each side of a rhachis. [ 1913 Webster ]