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) The green woodpecker, Picus viridis.

plural of yarrow

A river in Lancashire, England, which flows into the River Douglas. / A river, named Yarrow Water, in Scottish Borders council area, Scotland.

Achillea millefolium, a flowering plant widespread in the temperate Northern Hemisphere, formerly and sometimes used to stanch the flow of blood.

sweet maudlin, Achillea ageratum

(mineralogy) A trigonal-ditrigonal pyramidal mineral containing copper and sulfur.