Tan·sy n.
1. Bot. Any plant of the composite genus Tanacetum. The common tansy (Tanacetum vulgare) has finely divided leaves, a strong aromatic odor, and a very bitter taste. It is used for medicinal and culinary purposes.
2. A dish common in the seventeenth century, made of eggs, sugar, rose water, cream, and the juice of herbs, baked with butter in a shallow dish. [Obs.]
Double tansy Bot., a variety of the common tansy with the leaves more dissected than usual.
Tansy mustard Bot., a plant (Sisymbrium canescens) of the Mustard family, with tansylike leaves.
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