Is Tweaker in the Dictionary?

Is tweaker a word?

"Tweaker" is a slang term for a methamphetamine addict, and it comes from the term "tweak," which is another name for methamphetamine.

What does tweaker mean?

1 : one who makes minor adjustments to something (such as electronic equipment) to improve its performance or effectiveness : a person who tweaks something This set-it-and-forget-it approach may seem inconceivable to tweakers, but this isn't a piece of gear you want to be playing around with on a daily basis.—