The upper covering of a building or vehicle, serving as protection from weather.
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Proto-Germanicbefore 900 CEwell-attested
From OldEnglish 'hrōf' (roof, ceiling, top), from Proto-Germanic *hrōfą (roof), of uncertain PIE origin—possibly related to Old Norse 'hróf' (boat shed) and Old Irish 'cró' (enclosure, pen). The phonological history is striking: Old English 'hrōf' had the initial cluster 'hr-' which was lost in Middle English, and the vowel shifted through the Great Vowel Shift from /oː/ to its modern pronunciation. The Proto-Germanic rootmay connect to a PIE
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English 'roof' and 'roost' are likely related — OldEnglish 'hrōst' (a perch or framework for roosting birds) may derive from the same root as 'hrōf' (roof), both reflecting the idea of an overhead structure. Birds literally roost underthe roof.
pattern as 'proofs' and 'hoofs/hooves.' The metaphorical extension 'a roof over one's head' for basic shelter is attested from the 15th century, making the word stand metonymically for the entire house. Key roots: *hrōfą (Proto-Germanic: "roof, top covering (ultimate origin uncertain)").