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Webster's Dictionary (1865)

Op-pōs'i-ti-fō'li-oūs, a.

adjective

a. [Lat. oppositus and foliosus; Fr. oppositifolié. See OPPOSITE and FOLIOUS.] (Bot.) Opposite to the leaf; as, an oppositifolious peduncle.

A botanical drawing shows a vertical stem with pairs of opposite leaves at several levels.
Opposite Leaves.