tri·ad (tr   d , - d)n. 1. A group of three. 2. Music A chord of three tones, especially one built on a given root tone plus a major or minor third and a perfect fifth. 3. A section of a Pindaric ode consisting of the strophe, antistrophe, and epode. [Late Latin trias, triad-, from Greek, the number three; see trei- in Indo-European roots.] tri·ad ic (tr-d k) adj. |
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