tetanyPronunciation: /ˈtɛt(ə)ni/Definition of tetany noun [mass noun] a condition marked by intermittent muscular spasms, caused by malfunction of the parathyroid glands and a consequent deficiency of calcium. Origin: late 19th century: from French tétanie, from Latin tetanus (see tetanus)tetany in other Oxford dictionaries Definition of tetany in the US English dictionary