1 Retrieved October 19 2015 from http://www.acronymfinder.com/Radiology-Information-System%2fPicture-Archiving-and-Communication-System-(RIS%2fPACS).html. 2  APA style: RIS/PACS. (n.d.) Acronym Finder. ( 3 2015).
In music, a diminished triad ( Play ), also known as the minor flatted fifth (mâ­5), is a triad consisting of three minor thirds above the root â if built on C, a diminished triad would have a C, an Eâ­ and a Gâ­.
In music, a triad is a set of three notes that can be stacked in thirds. The term harmonic triad was coined by Johannes Lippius in his Synopsis musicae novae (1612). When stacked in thirds, the triad's members, from lowest pitched tone to highest, are called: 1  the root. 2  the third â its interval above the root being a minor third (three semitones) or a major third (four semitones).