adjective
indoor
IHN-daw
adjective
1
Located, used, or done inside a building.
"They installed an indoor pool for winter use."
"Indoor plants need less direct sunlight than outdoor ones."
How to Use Indoor
Learner’s notesIn plain EnglishHappening or existing inside a building, not outside.
Common mistake
"Indoor" is the adjective (an indoor pool); "indoors" is the adverb (stay indoors).
Easily confused with
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They installed an _____ pool for winter use.
Etymology
From "(with)in" plus "door," first recorded in 1711.