[yar-oh] 
| 1. | a composite plant, Achillea millefolium, of Eurasia, having fernlike leaves and flat-topped clusters of whitish flowers, naturalized in North America. |
| 2. | any of various other plants of the genus Achillea, some having yellow flowers. |
[yar-oh] | a river in SE Scotland, flowing into the Tweed. 14 mi. (23 km) long. |
| yar·row (yār'ō) n. 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. [Middle English yarowe, from Old English gearwe.] |