Cost″ma‐ry (k?st″m?–r?), n. [L. costum an Oriental aromatic plant (Gr. ���, cf. Ar. kost, kust) + Maria Mary. Cf. Alecost.] (Bot.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.