a. [ad. mod.L. bipinnātus: see BI- pref.2 3 and PINNATE, f. pinna wing.]

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  1.  Doubly or subordinately pinnate; see quot.

2

1794.  Martyn, Rousseau’s Bot., xxi. 301. The leaves are doubly winged or bipinnate.

3

1872.  Oliver, Elem. Bot., I. vii. 77. A leaf becomes twice pinnate (bi-pinnate) when the common petiole, instead of bearing leaflets, bears secondary petioles upon which the leaflets are pinnately arranged.

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  2.  Zool. Having feathery appendages in opposed pairs.

5

1856–8.  W. Clark, Van der Hoeven’s Zool., II. 63. Tail … without spur, bipinnate above.

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1868.  W. S. O., trans. Ocean World, vi. 142. Pennatulidæ … with polypes on bipinnate wings.

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