chickweed /ˈtʃɪkwiːd/noun 9forms 1 noun9 •Any of several small-leaved herbs of the genera Cerastium and Stellaria. •especially common chickweed (Stellaria media), a common, edible weed in North America and Europe. •Stellaria pro parte •Cerastium (mouse-ear chickweed) •Other plants of similar appearance and habit, including those of species: •Ageratum conyzoides •Holosteum (jagged chickweed) •Moenchia (upright chickweed) •Paronychia spp. (nailwort, whitlow-wort) formschickweeds