Ha, retards.
"Meth" is meth-amphetamine, which is a type of amphetamine. The "meth" from Meth-amphetamine comes from the chemical name "methyl". The chemical Methamphetamine is composed of an amphetamine molecule with an additional methyl group attached to its nitrogen (amine group). A methyl is one of the simplest atomic groups which can be added to a molecule: it is a single carbon atom with a set of (usually) 3 hydrogens.
CHEMCOMPARE Click on the above link and if you look on the far right end on these images, you can see that there is a "NH-CH3" on the Methamphetamine where there is a "NH2" on the amphetamine. For many of the known psychoactives, adding a methyl group slightly alters the effects, duration, and/or potency. As you start to pay attention to other chemical names, you'll see "meth" show up in many names and this will almost always indicate that there is a methyl group on the molecule somewhere. For Methamphetamine, the methyl allows it a little better fat solubility and thus better penetration into the brain.
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