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