The beginning of a prescription, consisting of the injunction, recipe, take, usually denoted by the sign ℞. [L. super-scribo, pp. -scriptus, to write upon or over]
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su·per·scrip·tion .sü-pər-'skrip-shən n the part of a pharmaceutical prescription which contains or consists of the Latin word recipe or the sign Rx
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su·per·scrip·tion (soo″pər-skripґshən) [L. superscriptio] the heading of a prescription, i.e., the symbol ℞ or the word Recipe, meaning “take.â€Medical dictionary. 2011.