roof
UK: ruːf | US: ruːf
n. the top covering of a building or vehicle
n. the upper limit or boundary of something (e.g., "price roof")
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The word "roof" traces back to Old English hrōf, meaning "covering" or "top." It shares Germanic roots with Dutch roef (cabin roof) and Old Norse hróf (boat shed). Unlike many English words, "roof" has retained its compact form without clear prefix/root/suffix divisions. Its simplicity reflects its ancient, functional role in shelter—evolving little in structure but expanding metaphorically (e.g., "roof of the mouth").
The rain leaked through a crack in the roof.
They installed solar panels on the roof.
The cathedral’s roof is a masterpiece of Gothic architecture.
High housing costs have hit the roof this year.
Bats often nest under the roof of old barns.