also in-door, 1711, opposed to outdoor, contracted from within door; the form indoors is attested from 1759 (within-doors is from 1750); as an adverb from 1801.
indoor activities for a rainy day
an indoor pool
an indoor setting
Indo-Iranian
indolence
indolent
indomitable
Indonesia
indoor
Indo-Pacific
indorse
indorsement
Indra
indrawn
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