The Collaborative International Dictionary
Adversifoliate
Adversifoliate \Ad*ver`si*fo"li*ate\, Adversifolious \Ad*ver`si*fo"li*ous\a. [L. adversus opposite + folium leaf.] (Bot.) Having opposite leaves, as plants which have the leaves so arranged on the stem.
Wiktionary
adversifoliate
a. (context botany English) Having leaf placed opposite each other on a stem