1) Herbicide 2) Weed killer 3) Weedkiller 
Simazine is an herbicide of the triazine class. The compound is used to control broad-leaved weeds and annual grasses. ==Preparation== Simazine may be prepared in the laboratory from cyanuric chloride crystals and a strong solution of ethyl amine (at least 50 percent by number in water). The reaction is highly exothermic and is therefore best carr...
<chemical> A triazine herbicide. ... Pharmacological action: herbicides, triazine. ... Chemical name: 1,3,5-Triazine-2,4-diamine, 6-chloro-N,N'-diethyl- ... (12 Dec 1998) ... 
[n] - a herbicide used to control weeds (especially among crops)
noun a herbicide used to control weeds (especially among crops)