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Webster 1913 Edition

Adj.

[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.

tripinnatifid ‎(not comparable)

(botany) Thrice pinnately cleft; said of a pinnatifid leaf when its segments are pinnatifid, and the subdivisions of these also are pinnatifid.