n. (in medicine) a group of three united or closely associated structures or three symptoms or effects that occur together. A portal triad in a portal canal of the liver consists of a branch of the portal vein, a branch of the hepatic artery, and an interlobular bile tubule.
the coexistence of *gallstones, diverticular disease, and hiatus *hernia in a patient. It is important to identify which of these conditions, if any, is causing the symptoms of dyspepsia. [C. F. M. Saint (1886–1973), South African surgeon]... saint’s triad
a syndrome characterized by the presence of asthma, nasal *polyps, and hypersensitivity to aspirin. [M. Samter (1908–99), German-born US physician]... samter’s triad
a combination of three clinical features that indicate the presence of an *insulinoma: (1) attacks of fainting, dizziness, and sweating on fasting; (2) severe hypoglycaemia present during the attacks; (3) relief from the attacks achieved by administering glucose. [A. O. Whipple]... whipple’s triad
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