Definition of petiolular in US English:
petiolular
adjective
Botany
rare
Of or relating to a petiolule.
Origin
Mid 19th century; earliest use found in Robert Mayne (1808–1868). From petiolule + -ar. Compare French pétiolulaire.
Pronunciation
petiolular
/ˌpɛtɪˈəʊljʊlə/