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.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  triad(Noun) A grouping of three. 2  triad(Noun) A chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale. 3  triad(Noun) on a CRT display, A group of three neighbouring phosphor dots, coloured green, red, and blue.