E / ectăsis
noun

ectăsis

gen. ectăsis · gender feminine · decl. 3rd
(acc. -in), , = ἔκτασις
the lengthening of a vowel short by nature: si
the lengthening of a vowel short by nature: si brevis est per naturam, sed hoc loco ectasin fecit, Serv. Verg. A. 1, 343.