What is the origin of terpsichorean?

The adjective terpsichorean “pertaining to dancing” is a derivative of the proper name Terpsichore, the muse of dancing and song, especially of dramatic choruses. Terpsichore comes from Greek Terpsichórē, a noun use of the feminine adjective terpsíchoros “delighting in dancing.” The element terpsi– comes from the verb térpein (also térpesthai) “to delight, gladden, cheer”; the second element, –choros, is a combining form of the noun chorós “a round dance, dancing floor, band of dancers, choir.” The etymology of chorós is uncertain: it may come from a Proto-Indo-European root gher-, ghor– “to enclose”; if so, the original meaning of chorós would be “an enclosed space (for dancing).” The root gher-, ghor– is also the source of Greek chórtos “enclosure, court,” Latin hortus “garden” (English horticulture), Sanskrit gṛhá– “house, dwelling place,” Proto-Slavic gordŭ “castle, fortress, town,” source of Russian górod “city, town” (cf. Nóvgorod “New Town”), Old Church Slavonic and South Slavic grad, as in Russian Stalingrad, Serbo-Croatian Beograd “Belgrade, White City.” Terpsichorean entered English in the first half of the 19th century.