1181, Anglo-Fr.
ivorie, from O.N.Fr.
ivurie (12c.), from L.
eboreus "of ivory," from
ebur (gen.
eboris) "ivory," probably via Phoenician from an African source (cf. Egyptian
ab "elephant," Coptic
ebu "ivory"). Replaced O.E.
elpendban, lit. "elephant bone." Applied in slang to articles made from it, such as dice (1830) and piano keys (1854). As a color, esp. in ref. to human skin, it is attested from 1590.
Ivories as slang for "teeth" dates from 1782.
Ivory tower (1911) first used 1837 in Fr. (
tour d'ivorie) by critic Charles-Augustin Sainte-Beuve (1804-1869) with reference to the poet Alfred de Vigny, whom he accused of excessive aloofness.
"Et Vigny, plus secret, Comme en sa tour d'ivoire, avant midi rentrait." [Saine-Beuve, "Pensées d'Août, a M. Villemain," 1837]