OTC

not traded or listed with an organized stock exchange (Finance); trading through telephone or computer and not on the floor of a stock exchange (Finance); available without a prescription (Medicine)

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OTC over the counter; said of drugs not required by law to be sold on prescription only. OTC abbr. over-the-counter OTC, adj See over-the-counter. [more]Otc - Community and Resources

Adjective
1. (of securities) not quoted on a stock exchange; "over-the-counter stocks"
(synonym) over-the-counter
(similar) unlisted

Over-the-counter. A medicine that can be bought without a prescription (doctor's order). Examples include analgesics (pain relievers) such as aspirin and acetaminophen. Also called nonprescription.