From Middle English rouble, rubel, robel, robeil, from Anglo-Norman *robel (“bits of broken stone”). Presumably related to rubbish, originally of same meaning (bits of stone). Ultimately presumably from Proto-Germanic *raub- (“to break”), perhaps via Old French robe (English rob (“steal”)) in sense of “plunder, destroy”; see also Middle English, Middle French -el.
- The broken remains of an object, usually rock or masonry.
- (geology) A mass or stratum of fragments of rock lying under the alluvium and derived from the neighbouring rock.
- (Can we find and add a quotation of Lyell to this entry?)
- (Britain, dialectal, in the plural) The whole of the bran of wheat before it is sorted into pollard, bran, etc.
- (Can we find and add a quotation of Simmonds to this entry?)