D defs.my
Entry 1 sense Webster, 1913

Gradus

/grād'-əs/ · Gra·dus · IPA /ˈɡɹeɪdəs/
01 n. A dictionary of prosody, designed as an aid in writing Greek or Latin poetry.
  1. 1.
    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.