See more synonyms on Thesaurus.com. noun, (used with a singular verb) 1. Biology. the science of heredity, dealing with resemblances and differences of related organisms resulting from the interaction of their genes and the environment.
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.
Narcotic Drugs. prescription only (Rx) are drugs classified according to their abuse potential by the DEA, by schedules, also have side effects such as euphoria, sedation, constipation, nausea & vomiting also they are used for pain, are usually opium, opium-like, or opiates.