/peuh pil'ee euh nay"sheuhs/ , adj. Bot.
1. having an irregular corolla shaped somewhat like a butterfly, as the pea and other leguminous plants.
2. belonging to the family Papilionaceae (Fabaceae), that is often included as part of the Leguminosae.
[ 1660-70; papilion- (s. of papilio ) butterfly + -ACEOUS ]