Definition of papilionaceous in English:
 papilionaceous
adjective pəˌpɪlɪəˈneɪʃəspəˌpɪliəˈneɪʃəs
Botany Relating to or denoting leguminous plants of a group (subfamily Papilionoideae or family Papilionaceae ) with flowers that resemble a butterfly.
 Example sentencesExamples
-  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.
 -  Flowers of normal plants are typically papilionaceous with a large standard petal, two free-wing petals, and two fused-keel petals.
 
Origin
  
Mid 17th century: from modern Latin Papilionaceae (plural), based on Latin papilio 'butterfly', + -ous.
   Definition of papilionaceous in US English:
 papilionaceous
adjectivepəˌpɪliəˈneɪʃəspəˌpilēəˈnāSHəs
Botany Relating to or denoting leguminous plants of a group (subfamily Papilionoideae or family Papilionaceae) with flowers that resemble a butterfly.
 Example sentencesExamples
-  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.
 -  Flowers of normal plants are typically papilionaceous with a large standard petal, two free-wing petals, and two fused-keel petals.
 
Origin
  
Mid 17th century: from modern Latin Papilionaceae (plural), based on Latin papilio ‘butterfly’, + -ous.