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.
They are Primary Triads. Ex.: The primary triads are most important in the structure of a composition. They have the function of key definitive. 1  A composition should establish its key in the beginning with the notes in Tonic triad and also end with a note in Tonic triad-mainly the tonic note.