noun Descargar 🔗Compartir Piretrina Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring. Examples : "The gardener sprayed pyrethrin on the roses to kill the aphids. " El jardinero roció piretrina sobre las rosas para matar los áfidos. compound substance chemistry agriculture insect plant science biology nature environment Chat con IAJuego de vocabularioPracticar lectura