Equitant \Eq"ui*tant\, a. [L. equitans, -antis, p. pr. of equitare to ride, fr. eques horseman, fr. equus horse.] 1. Mounted on, or sitting upon, a horse; riding on horseback. [1913 Webster] 2. (Bot.) Overlapping each other; -- said of leaves whose bases are folded so as to overlap and bestride the leaves within or above them, as in the iris. [1913 Webster]