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extraction
extractive
extractor
extractor fan
extracurricular
extraditable
extradite
extradition
extrados
extraembryonic membrane
extragalactic
extrajudicial
extralegal
extralimital
extraliterary
extramarital
extramundane
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extrados

ex·tra·dos [ ékstrə dòss, ékstrə dss ] (plural ex·tra·dos [ ékstrə dz ] or ex·tra·dos·es)


noun 
Definition:
 
outside of an arch: the outer curve of an arch

[Late 18th century. < French< Latin extra "outside" + French dos "back"]
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