A chemical added to a pesticide to keep it from injuring plants.

A substance that prevents objectionable changes when two or more substances that otherwise would not be compatible must be mixed.

A substance added to a pesticide formulation to eliminate or reduce phytotoxic effects of the pesticide to certain crops. See also adjuvant.

A chemical that when used in combination with a pesticide reduces its effects on non-target organisms. Only herbicide safeners have so far been produced, and these protect crops from injury by herbicides but do not prevent the herbicide from killing weeds.

a substance which reduces or eliminates the phytotoxic effects of a plant protection product on certain plant species