Freebase
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Freebase refers to the standalone basic form of an alkaloid, as opposed to its salt form. Most alkaloids are unstable and corrosive in their freebase form, and thus are usually stored in salt form, such as their HCl salt.
The term freebase is also often used to refer to crack, the freebase form of cocaine. When used as an intransitive verb, it refers to smoking crack.