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From The Collaborative International Dictionary of English v.0.48:
Gradus \Gra"dus\, n. [From L. gradus ad Parnassum a step to Parnassus.] A dictionary of prosody, designed as an aid in writing Greek or Latin poetry. [1913 Webster] He set to work . . . without gradus or other help. --T. Hughes. [1913 Webster]