THESAURUS
External
alien, apparent, border, circumference, cortex, cortical, covering, crust, envelope, epidermic, epidermis, exomorphic, exotic, exterior, extraneous, extraorganismal, extrinsic, facade, face, facet, foreign, fringe, front, impersonal, integument, lineaments, nonsubjective, objective, open, out, outer, outer face, outer layer, outer side, outer skin, outermost, outline, outlying, outmost, outside, outstanding, outward, outward-facing, over, perceptible, peripheral, periphery, public, rind, roundabout, seeming, shell, skin, superficial, superficies, superstratum, surface, top, visible
ROGET THESAURUS
External
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.