Definition of yarrow:

part of speech: noun

A plant.

Usage examples :

• At the end of the hour Brackley had lost a sovereign, and Yarrow had lost five pounds. "Here and Hereafter", - Barry Pain

• Sir John Hill says the best way of giving Yarrow is in a strong decoction of the whole plant. "Herbal Simples Approved for Modern Uses of Cure", - William Thomas Fernie

• He is best remembered for his fine ballad of The Braes of Yarrow "A Short Biographical Dictionary of English Literature", - John W. Cousin

• A tiny trickle of water flowed out of it, flowed down to join the Yarrow "The Gold Of Fairnilee", - Andrew Lang