What does "toxic" mean in this case. AFAIK "toxic" can mean that you will get a headache if you eat a gram, but it can also mean that it will kill you if it tou

What does "toxic" mean in this case. AFAIK "toxic" can mean that you will get a headache if you eat a gram, but it can also mean that it will kill you if it touches your skin. For example I do not mind drinking a beer or two, which includes 5% of toxic ethanol, but I prefer not having lead in my drinking water.