WordWeight : Weighing the Words

Pronunciation : Tri"ad
Part of Speech : n.
Etymology : [L.trias, -adis, Gr. triade. See Three, and cf. Trias, Trio.]
Definition : 1. A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.

2. (Mus.) (a) A chord of three notes. (b) The common chord, consisting of a tone with its third and fifth, with or without the octave.

3. (Chem.)

Defn: An element or radical whose valence is three. Triads of the Welsh bards, poetical histories, in which the facts recorded are grouped by threes, three things or circumstances of a kind being mentioned together. -- Hindoo triad. See Trimurti.
Source : Webster's Unabridged Dictionary, 1913