Definition of papilionaceous in English:

papilionaceous

adjective

Botany
  • Relating to or denoting leguminous plants of a group (subfamily Papilionoideae or family Papilionaceae) with flowers that resemble a butterfly.

    • ‘Flowers of normal plants are typically papilionaceous with a large standard petal, two free-wing petals, and two fused-keel petals.’
    • ‘The flowers have a typical papilionaceous corolla.’
    • ‘The corolla of Trigonellinae is typically papilionaceous, comprising a standard petal, two wing petals and a keel made up of two marginally fused petals.’

Origin

Mid 17th century: from modern Latin Papilionaceae (plural), based on Latin papilio butterfly, + -ous.

Pronunciation:

papilionaceous

/pəˌpɪlɪəˈneɪʃəs/