triternate

from The Century Dictionary.

• In botany, three times ternate: applied to a leaf whose petiole divides and twice subdivides into three, thus bearing twenty-seven leaflets, as in some Umbelliferæ. Also triplicate-ternate.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) Three times ternate; -- applied to a leaf whose petiole separates into three branches, each of which divides into three parts which each bear three leafiets.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany Three times ternate; applied to a leaf whose petiole separates into three branches, each of which divides into three parts which each bear three leaflets.