noun
augmented chord; augmented triad
Music theory term for a chord built from two stacked major thirds, producing an augmented fifth.
増三和音は、根音から第三音、第五音までがすべて長三度で構成される。
An augmented triad is constructed with major thirds between the root, third, and fifth.
Compound of 増 (augmented) + 三和音 (triad), a calque from Western music theory.