exterior

adj. outer, external, surface

n. outer part, outer layer

In general, the interior of something refers to the space or part inside of it, excluding any kind of wall or boundary around its outside. It has different, more specific definitions in different contexts.
See more at Wikipedia.org...

Noun
1. the region that is outside of something
(synonym) outside
(hypernym) region, part
(hyponym) outdoors, out-of-doors, open air, open
2. the outer side or surface of something
(synonym) outside
(hypernym) surface
Adjective
1. situated in or suitable for the outdoors or outside of a building; "an exterior scene"; "exterior grade plywood"; "exterior paints"
(antonym) interior
(similar) out(a)
(see-also) outdoor(a), out-of-door, outside
(attribute) position, spatial relation

n. exterior, outer layer, outer part

adj. exterior, external, outer; outlying; outward; upper; foreign

n. exterior, outside; surface; wing