triad

(tri’ad) [L. tri’as; Gr. rpeds group of three]. 1. Any trivalent element. 2. Trivalent. 3. A group of three objects or signs. Bezold’s t., retarded bone-conduction, le ened perception of deep tones, and negative Rinne’s sign, indicating otosclerosis. Dieulafoy's t., hypersensitivene of the skin, reflex muscular contraction, and tenderne at McBurney’s point in appendicitis, Grancher’s t., le ened vesicular quality of breathing, skodaic resonance, and increased vocal fremitus: a syndrome of commencing pulmonary _ tuberculosis. t.of Herz. See phrenocardia. Hutch- m’s t., a syndrome of diffuse interstitial keratitis, labyrinthine disease, and Hutch in son teeth: seen in inherited syphilis. Merse burger t., goiter, exophthalmos, and tachycardia, the three cardinal symptoms of Basedow’s disease.