a. [ Pref. tri- + pinnate. ] (Bot.) Having bipinnate leaflets arranged on each side of a rhachis. [ 1913 Webster ]
a. [ Pref. tri- + pinnatifid. ] (Bot.) Thrice pinnately cleft; -- said of a pinnatifid leaf when its segments are pinnatifid, and the subdivisions of these also are pinnatifid. [ 1913 Webster ]