equitant, a. [L. equitans, -antis, p. pr. of equitare to ride, fr. eques horseman, fr. equus horse.].
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Mounted on, or sitting upon, a horse; riding on horseback. [1913 Webster]
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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]