ballade (n.)youdaoicibaDictYouDict
late 14c., an earlier borrowing of ballad (q.v.) with a specific metrical sense. Technically, a poem consisting of one or more triplets of seven- (later eight-) lined stanzas, each ending with the same line as the refrain, usually with an envoy. Popularized 19c. as a type of musical composition by Frédéric Chopin. Ballade royal is recorded from late 15c.
tarantella (n.)youdaoicibaDictYouDict
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.
trigeminal (adj.)youdaoicibaDictYouDict
1815, from Latin trigeminus "born in threes," as a noun, "triplets;" from tri- (see tri-) + geminus "born at the same birth" (see geminate (adj.)).