Definition and background:
The interval of an augmented fourth ( enharmonically spelled as a diminished fifth). This interval was known as the "devil in music" in the Medieval era because it is the most dissonant sound in the scale. the diminished fifth or augmented fourth, exactly three whole steps, and divides the octave right down the middle
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Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary