1832, "pertaining to a period of 300 years," from ter- "three times" + centenary. As a noun from 1835. Related: Tercentennial (1862 as an adjective; 1872 as a noun).
teratogeny
teratology
teratoscopy
terbium
tercel
tercentenary
terceroon
tercet
*tere-
terebinth
tergiversate
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