1
: angina pectoris of a usually benign form in which the coronary arteriogram is normal
2
: metabolic syndrome
Metabolic syndrome, sometimes called syndrome X, was first defined in 1988 as a collection of health risks that may increase the chances of developing cardiovascular disease two-and-a-half to four times, and diabetes by four to six times.—
Catherine Arnst, Business Week
Catherine Arnst, Business WeekCite this Entry
“Syndrome X.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/syndrome%20X. Accessed 4 Nov. 2025.
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