Hypertext Webster Gateway: "gradus"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
He set to work . . . without gradus or other help. --T.
Hughes.
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