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Hi Janet , Could it be from the word "receipt" (derived from Latin "recepta" ). Cheers , Janet Paterson wrote: > hi all > > it just occurred to me > i don't know what Rx means other than prescription > what is its source? [i presume latin] > what about dx? for diagnosis? is it an 'official' term? +----| Joao Paulo de Carvalho |------ + | [log in to unmask] | +--------| Salvador-Bahia-Brazil |------+