Etymology
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tetany (n.)

1890, from French tétanie "intermitent tetanus," from Modern Latin tetania (see tetanus).

updated on November 04, 2012

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Definitions of tetany from WordNet

tetany (n.)
clinical neurological syndrome characterized by muscular twitching and cramps and (when severe) seizures; associated with calcium deficiency (hypoparathyroidism) or vitamin D deficiency or alkalosis;
Synonyms: tetanilla / intermittent tetanus / intermittent cramp / apyretic tetanus
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.