See acyrologia, which is the classical term for malapropism, a confused use of words in which an appropriate word is replaced by one with a similar sound but a ludicrously inappropriate meaning. Malapropism is a neologismA new, deliberately invented word. inspired by the name of the character Mrs. Malaprop, in Richard Sheridan’s The Rivals, 1775. Her name is an abbreviated portmanteauA neologism created by combining two words. for mal-appropriate.