noun🔗SharePyrethrineAny of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring."The gardener sprayed pyrethrin on the roses to kill the aphids. "Der Gärtner sprühte Pyrethrin auf die Rosen, um die Blattläuse zu töten.compoundsubstancechemistryagricultureinsectplantsciencebiologynatureenvironmentChat with AIVocabulary GamePractice Reading
