festra

From fenestra (“window”) via syncope and nasal deletion with compensatory lengthening.

• (Classical Latin) IPA^(key): [ˈfeːs.tra]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈfɛs.t̪ra]

fēstra f (genitive fēstrae); first declension

1. (pre-Classical) alternative form of fenestra (“window”)

First-declension noun.

• “festra”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• "festra", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• festra in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.