n. 1. European weed naturalized in the southwestern U. S. and Mexico (Erodium cicutarium), having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender pinlike fruits that stick straight up; it is often grown for forage. Syn. -- redstem storksbill, alfilaria, alfileria, filaree, filaria, pin grass, pin clover, Erodium cicutarium. [ WordNet 1.5 ]