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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
Jamie Carter, Forbes.com, 7 Sep. 2025
Total lunar eclipses — which always occur during a full moon — often arrive in triads, accompanied by at least one solar eclipse two weeks before and/or after.
—Jamie Carter, Space.com, 3 Sep. 2025
Worse, a third nuclear superpower, China, is turning the former dyad into a triad.
—Andreas Kluth, Twin Cities, 17 Aug. 2025
This discovery becomes a tear in the banal fabric of everyday life, in which Maria reluctantly assumes the triad of caretaker, undertaker and executor – faced with a series of subdued and, at times, perverse bureaucratic exchanges.
—Olivia Bennett, Variety, 12 Aug. 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 9 Sep. 2025.
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triad
noun
Medical Definition
triad
noun
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