Word Study
indoor
CIDE DICTIONARY
indoor, a.
Done or being within doors; within a house or institution; domestic; as, indoor work. [1913 Webster]
OXFORD DICTIONARY
indoor, adj. situated, carried on, or used within a building or under cover (indoor aerial; indoor games).
Etymology
earlier within-door: cf. INDOORS
ROGET THESAURUS
indoor
Interiority
N interiority, inside, interior, interspace, subsoil, substratum, intrados, contents, substance, pith, marrow, backbone, heart, bosom, breast, abdomen, vitals, viscera, entrails, bowels, belly, intestines, guts, chitterings, womb, lap, penetralia, recesses, innermost recesses, cave, interior, internal, inner, inside, inward, intraregarding, inmost, innermost, deep seated, gut, intestine, intestinal, inland, subcutaneous, abdominal, coeliac, endomorphic, interstitial, inwrought, inclosed, home, domestic, indoor, intramural, vernacular, endemic, internally, inwards, within, in, inly, here in, there in, where in, ab intra, withinside, in doors, within doors, at home, in the bosom of one's family.For further exploring for "indoor" in Webster Dictionary Online