triadic

triadleft to right: C major, E minor, and D diminished triads

tri·ad

T0343300 (trī′ăd′, -əd)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.

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[Late Latin trias, triad-, from Greek, the number three; see trei- in Indo-European roots.]

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tri·ad′ic (trī-ăd′ĭk) adj.