One of the mysteries of the English language finally explained.
Twitching of muscles (and their tendons), especially of the hands and wrist, seen especially in the late stages of typhoid and typhus fever; an instance of this.
Late 17th century; earliest use found in Robert Boyle (1627–1691), natural philosopher. From post-classical Latin subsultus tendinum (1674 or earlier; 1670 as tendinum subsultus (T. Willis Pathologiae Cerebri 273) from subsultus + tendinum, genitive plural of tendin-, tendo.
subsultus tendinum/ˌsʌbˈsʌltəs ˈtɛndɪnəm/
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