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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
John Ortved, Vogue, 29 Oct. 2025
There’s a triad of evil that Cipher’s a part of all season, which emerges in episode six upon Stan Edgar’s (Giancarlo Esposito) return.
—Jackie Strause, HollywoodReporter, 24 Oct. 2025
Those who scored high on dark triad traits were more likely to use touch to manipulate their partners.
—Alice Gibbs, MSNBC Newsweek, 24 Oct. 2025
Anyone who doesn’t fit into this machine – triads, activists, labor unions – tend to just disappear, Tan explains.
—Liz Shackleton, Deadline, 1 Oct. 2025
See All Example Sentences for triad
Cite this Entry
“Triad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triad. Accessed 4 Nov. 2025.
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triad
noun
Medical Definition
triad
noun
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