In music a mixed-interval chord is a chord not characterized by one consistent interval. Chords characterized by one consistent interval, or primarily but with alterations, are equal-interval chords. Mixed interval chords "lend themselves particularly" to atonal music since they tend to be dissonant.[2]
Equal-interval chords are often of indeterminate root and mixed-interval chords are also often best characterized by their interval content.[2] "Equal-interval chords are often altered to make them 'impure' as in the case of quartal and quintal chords with tritones, chords based on seconds with varying intervals between the seconds."[2]
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Alex Skolnick - Fourth Interval Chord Building
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Music Theory Lesson / 7th Chords and Intervals / MarcNicholasMusic.com
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All Tritones Song (the devil's interval)