The Collaborative International Dictionary
Milfoil \Mil"foil\, n. [F. mille-feuille, L. millefolium; mille thousand + folium leaf. See Foil a leaf.] (Bot.) A common composite herb ( Achillea Millefolium) with white flowers and finely dissected leaves; yarrow.
Water milfoil (Bot.), an aquatic herb with dissected leaves ( Myriophyllum).
Yarrow \Yar"row\, n. [OE. yarowe, yarwe, [yogh]arowe, AS. gearwe; akin to D. gerw, OHG. garwa, garawa, G. garbe, schafgarbe, and perhaps to E. yare.] (Bot.) An American and European composite plant ( Achillea Millefolium) with very finely dissected leaves and small white corymbed flowers. It has a strong, and somewhat aromatic, odor and taste, and is sometimes used in making beer, or is dried for smoking. Called also milfoil, and nosebleed.
Wikipedia
Achillea millefolium, commonly known as yarrow or common yarrow, is a flowering plant in the family Asteraceae. It is native to temperate regions of the Northern Hemisphere in Asia, Europe, and North America. It has been introduced as a feed for live stock in places like New Zealand and Australia. However, it is a weed in those places and sometimes also in its native regions.
In New Mexico and southern Colorado, it is called plumajillo (Spanish for 'little feather') from its leaf shape and texture. In antiquity, yarrow was known as herbal militaris, for its use in stanching the flow of blood from wounds. Other common names for this species include gordaldo, nosebleed plant, old man's pepper, devil's nettle, sanguinary, milfoil, soldier's woundwort, thousand-leaf, and thousand-seal.
Usage examples of "achillea millefolium".
The flowers of the Yarrow (Achillea millefolium), and other composite plants, which have been used as adulterants of Elder flowers differ still more markedly in appearance and their presence in the drug is readily detected.