Real Dictionary

chickweed
uncountable noun: Chickweed is a plant with small leaves and white flowers which grows close to the ground.

chickweed in American English
any of several low-growing plants (esp. genera Cerastium and Stellaria) of the pink family, often found as weeds in lawns and gardens
noun: any plant of the genus Stellaria, of the pink family, as S. media, a common Old World weed whose leaves and seeds are relished by birds

chickweed in British English
noun: any of various caryophyllaceous plants of the genus Stellaria, esp S. media, a common garden weed with small white flowers