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The best-known type of triad is a type of musical chord consisting of three notes. A D-major triad is made up of the notes D, F-sharp, and A; an F-minor triad is made up of F, A-flat, and C; and so on. Major and minor triads form the basis of tonal music, and songs and other pieces usually end with a triadic harmony. In medicine, a triad is a set of three symptoms that go together. The Chinese criminal organizations called triads got their name from the triangular symbol that they used back when they began, centuries ago, as patriotic organizations. Today, with over 100,000 members, the triads operate in the U.S., Canada, and many other countries.
Examples of triad in a Sentence
Ryan Brennan
april 1, Miami Herald, 1 Apr. 2026
The site was historically a worship center for the lioness goddess Repyt, who formed a religious triad with the fertility god Min of Akhmim and the child deity Kolanthes.
—Ryan Brennan
april 1, Kansas City Star, 1 Apr. 2026
Athribis was historically a worship center for the lioness goddess Repyt, who formed a religious triad with the fertility god Min of Akhmim and the child deity Kolanthes.
—Ryan Brennan, Fort Worth Star-Telegram, 1 Apr. 2026
Each triad of the three colors serves as a single pixel in the 1080p image.
—M. David Stone, PC Magazine, 1 Apr. 2026
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Cite this Entry
“Triad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triad. Accessed 5 Apr. 2026.
Copy CitationKids Definition
triad
noun
Medical Definition
triad
noun
