Definify.com

Webster 1913 Edition

Papilionaceous

Pa-pilˊio-na′ceous

,
Adj.
1.
Resembling the butterfly.
2.
(Bot.)
(a)
Having a winged corolla somewhat resembling a butterfly, as in the blossoms of the bean and pea.
(b)
Belonging to that suborder of leguminous plants (
Papilionaceæ
) which includes the bean, pea, vetch, clover, and locust.

Webster 1828 Edition

Papilionaceous

PAPILIONA'CEOUS

,
Adj.
Resembling the butterfly; a term in botany, used to describe the corols of plants which have the shape of a butterfly,such as that of the pea. The papilionaceous plants are of the leguminous kind.
The papilionaceous corol is usually four-petaled, having an upper spreading petal, called the banner, two side petals called wings, and a lower petal called the keel.

Similar Results