Well, that doesn't make any sense either, as major chords don't have any perfect fourths in them either, unless you count the interval between the fifth degree and the tonic in an inversion.

For the harmonic convention of chords based on stacked fourths, I've always heard it called "quartal" harmony, but my knowledge doesn't go very deep there.

In any case, wikipedia disagrees.

> In music theory, a tetrachord (Greek: τετράχορδoν; Latin: tetrachordum) is a series of four notes separated by three intervals