Scrabble Dictionary

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Yes, triad is playable

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"Triad" Definition

noun

A group of three.
A section of a Pindaric ode consisting of the strophe, antistrophe, and epode.
Music A chord of three tones, especially one built on a given root tone plus a major or minor third and a perfect fifth.
A union or group of three .
A chord of three tones consisting of a root with its third and fifth and constituting the harmonic basis of tonal music.