Any of several plants of the genus Achillea of the composite family, especially A. millefolium, native to Eurasia, having finely dissected foliage and flat corymbs of usually white flower heads. Also called achillea, milfoil.
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.