Costmary
Costmary (k?st"m?-r?) , noun
[Latin costum an Oriental aromatic plant (Greek {not transcribed}, compare Arabic kost, kust) + Maria Mary. Compare Alecost.]
(Botany) A garden plant (Chrysanthemum Balsamita) having a strong balsamic smell, and nearly allied to tansy. It is used as a pot herb and salad plant and in flavoring ale and beer. Called also alecost.