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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
Edward Conroy, Forbes, 11 Mar. 2025
At moments, the recorded strings grope toward a recognizable tonality, with trembling triads superimposed.
—Alex Ross, The New Yorker, 27 Jan. 2025
The opening page, featuring a photograph of the six pillars of the Temple of Jupiter viewed from the triad of arched windows fronting the Palmyra’s balcony, was printed on a sheet of pink paper.
—Youmna Melhem Chamieh, Harper's Magazine, 2 Jan. 2025
There is no doubt that shaking a child can cause injuries, including those that comprise the shaken baby syndrome triad.
—Jeff Kukucka, Scientific American, 26 Oct. 2024
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Cite this Entry
“Triad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triad. Accessed 15 Mar. 2025.
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triad
noun
Medical Definition
triad
noun
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