EPENTHESIS

[epen.the.sis] n, pl -the.ses [LL, fr. Gk, fr. epentithenai to insert a letter, fr. epi- + entithenai to put in, fr. en- + tithenai to put--more at do] (1543): the insertion or development of a sound or letter in the body of a word -- ep.en.thet.ic adj