noun Music.
an interval consisting of three whole tones; an augmented fourth.

1600–10; < Medieval Latin tritonus < Greek trítonos having three tones. See tri-, tone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tritone (ˈtraɪˌtəʊn)
a musical interval consisting of three whole tones; augmented fourth

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica


in music, the interval encompassed by three consecutive whole steps, as for instance the distance from F to B (the whole steps F-G, G-A, and A-B). In semitone notation, the tritone is composed of six semitones; thus it divides the octave symmetrically in equal halves. In musical notation the tritone is written either as an augmented fourth (e.g., F-B or C-F) or as a diminished fifth (e.g., B-F or C-G).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The organ begins with a slow-motion melody that is defined by jagged intervals of the major seventh and the tritone.
The views presented here are from a small fan-folded souvenir booklet of fifteen tritone chromolithographs.
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