Definition of Rx Rx: A medical prescription. The symbol "Rx" is
usually said to stand for the Latin word "recipe" meaning "to
take." It is customarily part of the superscription (heading) of
a prescription. Another explanation for the origin of Rx is that
it was derived from the astrological sign for Jupiter which was
once placed on prescriptions to invoke that god's blessing on
the drug to help the patient recover.Source: MedTerms™ Medical
Dictionary Last Editorial Review: 4/27/2011 5:27:15 PM Medical
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