One of the mysteries of the English language finally explained.
A horse suitable for use on roads, in later use typically one capable of speed when pulling a light carriage; a roadster.
Old English (in an earlier sense). Cognate with or formed similarly to Old High German reitros from the Germanic base of Old English rād riding + the Germanic base of horse.
road horse/ˈrəʊd hɔːs/
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