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The Collaborative International Dictionary
Passuses

Passus \Pas"sus\, n.; pl. L. Passus, E. Passuses. [L., a step, a pace. See Pace.] A division or part; a canto; as, the passus of Piers Plowman. See 2d Fit.

Wiktionary
passuses

n. (plural of passus English)