Any of several plants of the genus Tanacetum, especially T. vulgare, native to Eurasia, having corymbs of buttonlike yellow flower heads and aromatic, pinnately dissected leaves that are sometimes used medicinally.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.