One of the mysteries of the English language finally explained.
A roofing material composed of felt impregnated with bitumen; any of various other building and construction materials, typically with insulating properties. [A trademark in the United Kingdom.]
Late 19th century; earliest use found in Ice & Refrigeration. From ruber, alteration of rubber + -oid. Originally a trademark in the United States, said to have been first used 1890.
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