Also 8 in Latin form euphonismus. [f. as prec. + -ISM.] The habit of using well-sounding words or names; a well-sounding combination or expression.
1774. Westm. Mag., II. 567/1. The metaphor and digression, the allegory and euphonismus.
1820. Blackw. Mag., VII. 664. This elaborate system of euphonism.
1847. in Oswald, Etym. Dict.