Triad
Triad , noun
[Latin trias, -adis, Greek {not transcribed}, {not transcribed}, from{not transcribed}, {not transcribed}, three: compare French triade. See Three, and compare Trias, Trio.]
1.
A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.
2.
(a) (Music) A chord of three notes.
(b)
(Music) The common chord, consisting of a tone with its third and fifth, with or without the octave.
3.
(Chemistry) An element or radical whose valence is three.
Collocations (2)
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.
Hindu triad , See Trimurti.