tarantella: [18] In the 15th century in southern Italy an epidemic of a curious nervous disorder broke out, one of whose symptoms was an uncontrollable compulsion to whirl and cavort around, as if dancing. The people attributed it to the bite of a spider, the tarantula [16], named after the local town and seaport of Taranto. In due course the dancing came to be rationalized as a method of counteracting the effects of the spider’s bite, and it was named tarantella, a diminutive form of Taranto. The word finally came to stand for a particular type of dance.
1782, "peasant dance popular in Italy," originally "hysterical malady characterized by extreme impulse to dance" (1630s), epidemic in Apulia and adjacent parts of southern Italy 15c.-17c., popularly attributed to (or believed to be a cure for) the bite of the tarantula. This is likely folk-etymology, however, and the names of the dance and the spider more probably share an origin in Taranto, the name of a city in southern Italy (see tarantula). Used from 1833 to mean the style of music that accompanies this dance, usually in 6/8 time, with whirling triplets and abrupt major-minor modulations. Related: Tarantism.
