any of a number of perennial plants of the mint family, esp. sweet marjoram
See marjoram in American Heritage Dictionary 4
(märˈjər-əm)
noun
Any of several aromatic Eurasian or Mediterranean plants of the genus Origanum, especially O. majorana or O. vulgare, having small, purplish to white flowers and opposite leaves. Also called sweet marjoram, wild marjoram.
The leaves of any of these plants used as a seasoning.