Related formstri·pin·nate·ly, adverb
Examples from the Web for tripinnate
Pinnule, a secondary division of a bipinnate or tripinnate leaf, 66.
Fronds eight to eighteen inches long, lanceolate-oblong, tripinnate.The Fern Lover's Companion|George Henry Tilton
Pinna, a primary division with its leaflets of a bipinnate or tripinnate leaf.
When these leaflets are again divided in the same way, the leaf becomes thrice pinnate, or tripinnate, as in many Acacias.