bipinnate

adjective

(L. bis: twice; pinna: feather) Invertebrates: Twice pinnate--the featherlike side branches of a pinnate structure are themselves divided into a pinnate structure.
Plants: Of leaves, twice pinnately divided, the primary leaflets being again divided into secondary leaflets, i.e. having leaflets that are further subdivided in a pinnate arrangement; twice-pinnately branched. Cf. pinnate, tripinnate.