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Answer for the clue "Outside curved surface of an arch ", 8 letters:
extrados

Alternative clues for the word extrados

Word definitions for extrados in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context architecture English) The outer or upper curve of an arch.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Extrados \Ex*tra"dos\, n. [F.; pref. extra- outside + dos (L. dorsum) the back.] (Arch.) The exterior curve of an arch; esp., the upper curved face of the whole body of voussoirs. See Intrados .

WordNet Word definitions in WordNet
n. the exterior curve of an arch