D
Text: 1) The first note of the Phrygian, afterwards called Dorian, Mode. 2) The second note of the nromal scale. 3) The scale having two sharps in its signature. 4) The name given to a string tuned to D, e.g., the third string of the violin, the second of the viola and of the violoncello. 5) The name of a clef in old mensurable music.
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Source: 125