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The Collaborative International Dictionary
Plantal

Plantal \Plant"al\, a. [L. planta a plant.] Belonging to plants; as, plantal life. [Obs.]
--Dr. H. More.

Wiktionary
plantal

a. 1 (context obsolete English) Belonging to plants. 2 (context obsolete English) Of the nature of implanting or uniting.

WordNet
plantal

adj. of or relating to plants