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/ˈsʌnˌɹuːf/ · noun
(automotive) A fixed or operable opening in a vehicle roof (car or truck) which allows fresh air and/or light to enter the passenger compartment. A sunroof may include a transparent or opaque panel and may be manually operated or power driven..
Use sun roof when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sun roof means (automotive) A fixed or operable opening in a vehicle roof (car or truck) which allows fresh air and/or light to enter the passenger compartment. A sunroof may include a transparent or opaque panel and may be manually operated or power driven..
Common synonyms include sunshine-roof.
The opposite depends on the specific sense.
Use sun roof where its definition matches the intended context.
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