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

(UK) The green woodpecker, Picus viridis.

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.

plural of yarrow

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.