The Collaborative International Dictionary
Etacism
Etacism \E"ta*cism\, n. [Gr. ? the letter ?, ?. Cf. Itacism.] (Greek Gram.) The pronunciation of the Greek [eta] (eta) like the Italian e long, that is like a in the English word ate. See Itacism.
Wiktionary
etacism
n. (context grammar English) The pronunciation of the Greek eta like the Italian long e, or the vowel in the English word (term: ate).