A chemical class of herbicides, which includes atrazine and prometon.

(Triazines) Group of herbicides commonly used on field crops; the relatively high solubility and slower degradation time of this pesticide compared to others of this type give rise to a variety of problems of environmental toxicity.(Translated from Ramade, F. Dictionnaire encyclopédique de l'écologie et des sciences de l'environnement. Édiscience international, Paris, 1993.)

any of three isomeric compounds having three carbon and three nitrogen atoms in a six-membered ring

A triazine is one of three organic chemicals, isomeric with each other, whose empirical formula is 333.