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.
A diminished 7th chord is built on minor thirds, so itâs one half step bigger than a whole step (a step and a half, or 3 half-steps). Just as there is only one Chromatic scale and two Whole Tone scales, there are only three possible diminished 7th chords. After that they are all just inversions â starting on different notes of the same chord. When you build a diminished 7th chord you start with a note and count 3 half-steps to each successive note.