Thor″ough‐pin′ (?), n.(Far.) A disease of the hock (sometimes of the knee) of a horse, caused by inflammation of the synovial membrane and a consequent excessive secretion of the synovial fluid; — probably so called because there is usually an oval swelling on each side of the leg, appearing somewhat as if a pin had been thrust through.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.