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1. an element with a valence of three.
2. a group of three similar bodies, or a complex composed of three items or units.
acute compression triad Beck's triad.
Andersen's triad Andersen's syndrome.
Beck's triad rising venous pressure, falling arterial pressure, and small quiet heart; characteristic of cardiac compression; called also acute compression triad.
Cushing's triad decreased pulse, increased blood pressure, and a widening pulse pressure associated with increased intracranial pressure; it is a late clinical sign and may indicate brainstem herniation.
Hutchinson's triad diffuse interstitial keratitis, labyrinthine disease, and Hutchinson's teeth, seen in congenital syphilis.
Saint's triad hiatus hernia, colonic diverticula, and cholelithiasis.