Definition of costmary
: an aromatic composite Eurasian herb (Chrysanthemum balsamita synonym Tanacetum balsamita) having leaves used as a potherb and in flavoring
Origin and Etymology of costmary
Middle English costmarie, from coste costmary (from Old English cost, from Latin costum, from Greek kostos, a fragrant root) + Marie the Virgin Mary
First Known Use: 15th century
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