Triad

• Hutchinson’s triad
  - រោគធ្មេញដោយសារជំងឺស្វាយក្រាបពីកំណើត

1.

A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.

2.

A chord of three notes.

3.

The common chord, consisting of a tone with its third and fifth, with or without the octave.

4.

An element or radical whose valence is three.