Definition of oregano
1
: a bushy perennial mint (Origanum vulgare) with leaves that are used as a seasoning and a source of aromatic oil
— called also origanum, wild marjoram
2
: any of several plants (genera Lippia and Coleus) other than oregano of the vervain or mint families
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Merriam-Webster unabridged
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Time Traveler for oregano
The first known use of oregano was in 1771
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