Entry 1 sense Webster, 1913 Interpetiolar · In·ter·pet·i·o·lar · IPA /ˌɪntə(ɹ)ˌpɛtiˈəʊlə(ɹ)/ 01 a. Being between petioles. Cf. Intrapetiolar. 1. Being between petioles. Cf. Intrapetiolar.(Bot.) See: Intrapetiolar