transcription, транскрипция: [ ˈek-strə-ˌdäs, -ˌdō; ek-ˈstrā-ˌdäs ]
noun
( plural ex·tra·dos·es -ˌdä-səz ; or ex·tra·dos -ˌdōz, -ˌdäs)
Etymology: French, from Latin extra + French dos back — more at dossier
Date: 1772
: the exterior curve of an arch — see arch illustration