Marjoram \Mar"jo*ram\, n. [OE. majoran, F. marjolaine, LL. marjoraca, fr. L. amaracus, amaracum, Gr. ?, ?.] (Bot.) A genus of mintlike plants ({Origanum}) comprising about twenty-five species. The sweet marjoram ({O. Majorana}) is pecularly aromatic and fragrant, and much used in cookery. The wild marjoram of Europe and America is {O. vulgare}, far less fragrant than the other.