One of the mysteries of the English language finally explained.
An antibiotic structurally related to vancomycin, obtained from the fermentation products of the actinomycete Nocardia lurida and now used mainly for the laboratory investigation of blood platelet function; (more fully "ristocetin A", "ristocetin B") either of the two closely related compounds of which this antibiotic is a mixture.
1950s. From risto- (of unknown origin) + -cetin.
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