costmary noun1 •An aromatic plant (Tanacetum balsamita), once used to flavour ale (prior to use of hops); also used as a bookmark in Bibles and other holy texts to dissuade silverfish and other pests.The Marigolde, and cherefull Rosemarie; / The Spartan Mirtle, whence sweet gumb does flowe; / The purple Hyacinths, and fresh Costmarie, / And Saffron, sought for in Cilician soyle — 1591 formscostmaries
