Extrados

• POS: Noun
• HYPHEN: ex=tra=dos

CIDE DICTIONARY

Extrados, n. [F.; pref. extra- outside + dos (L. dorsum) the back.].

 The exterior curve of an arch; esp., the upper curved face of the whole body of voussoirs. See Intrados.  [1913 Webster]

OXFORD DICTIONARY

Extrados, n. Archit. the upper or outer curve of an arch (opp. INTRADOS).

Etymology

EXTRA- + dos back f. L dorsum

ROGET THESAURUS

Extrados

Exteriority

N exteriority, outside, exterior, surface, superficies, skin, superstratum, disk, disc, face, facet, extrados, excentricity, eccentricity, circumjacence, exterior, external, outer most, outward, outlying, outside, outdoor, round about, extramural, extralimitary, extramundane, superficial, skin-deep, frontal, discoid, extraregarding, excentric, eccentric, outstanding, extrinsic, ecdemic, exomorphic, externally, out, with out, over, outwards, ab extra, out of doors, extra muros, in the open air, sub Jove, sub dio, a la belle etoile, al fresco.