Noun
augmented triad (plural augmented triads)
(music) a triad with an augmented fifth between the bottom note and the top note
The inversions of an augmented triad introduce no intervals (allowing for enharmonic equivalents ) that are absent from its root position. Source: Internet
The first inversion is enharmonically equivalent to a new augmented triad in root position. Source: Internet
Thus the diminished-seventh chord would be C3 and the augmented triad would be C4. Source: Internet