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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
Kimberly Holland, Southern Living, 26 Apr. 2025
Auspicious or malignant, when there’s a triad, people pay attention.
—Wilder Davies, Bon Appetit Magazine, 25 Apr. 2025
These deities were part of a local triad of gods in ancient Thebes (in present-day Luxor) that represented a family group.
—Eli Wizevich, Smithsonian Magazine, 12 Mar. 2025
Today, many Americans can join a polyamorous triad, remain child-free by choice, launch a new career in their 30s, or dedicate themselves to running ultramarathons, all without ruffling any feathers within their community.
—Olga Khazan, The Atlantic, 5 Mar. 2025
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Cite this Entry
“Triad.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triad. Accessed 24 May. 2025.
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triad
noun
Medical Definition
triad
noun
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