n. A perennial herb, Tanacetum vulgare, a stout erect plant 2 or 3 feet high, with pinnate cuttoothed leaves, and yellow ray-less heads in a terminal corymb.n. One of several plants with somewhat similar leaves, as the milfoil, Achillea Millefolium, the silverweed (also goose-tansy), and the ragwort, Senecio Jacobæa. See the phrases below.n. A pudding or cake made with eggs, cream, sugar, rose-water, and the juice of tansy, to which that of spinach, sorrel, or other herbs was sometimes added.