noun

• Any of several pungent Eurasian and North American herbs, of the genus Achillea, used in traditional herbal medicine.
• Common yarrow, Achillea millefolium, the type species of the genus.
• (UK) A green woodpecker, of species Picus viridis.
• A river in Lancashire, England, which flows into the River Douglas.
• A river, named Yarrow Water, in Scottish Borders council area, Scotland.
• A hamlet and parish in the Yarrow Valley, Scottish Borders council area (OS grid ref NT3527).
• A hamlet in Sedgemoor district, Somerset, England.
• A small community in British Columbia, Canada.
• An unincorporated community in Missouri, United States.
• A surname.