Rx

On a prescription the symbol Rx (or R) stands for the word Recipe, meaning (in Latin) "to take." It is usually a part of the superscription (or heading) of the prescription. The other parts of the prescription are: {{}}the inscription which contains the names and quantities of the ingredients; the subscription or directions for compounding the drug; and the signature which is often preceded by the sign s. standing for signa, mark, giving the directions to be marked on the container. Now in pharmacological contexts like catalogs, the symbol Rx indicates that a drug or medicine is not free to buy, but has to be prescribed by a certified physician. The modern meaning of Rx is thus that only a certified physician may prescribe this medicine.

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rapid exchange; reaction; residual tumor not assessed [TNM (tumor-node-metastasis) classification]

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Rx 'är-'eks n a medical prescription