rooftop
n. countable A2 Elementary US //ˈɹufˌtɑp// UK //ɹˈuːftɒp// rooftop
n. the outside surface on top of a building. You can sometimes walk on it or use it for a garden.
n. the outer surface of the top of a building. Often used as a modifier in compound nouns like 'rooftop garden' or 'rooftop bar'.
We watched the sunset from the hotel rooftop.
The city council encouraged residents to install solar panels on every available rooftop to reduce energy costs.
Urban planners are increasingly advocating for green rooftops to mitigate the heat island effect and provide recreational spaces in densely populated districts.
Usage
Often functions as an attributive modifier before another noun.