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Definition of Bath salt
1. Noun. (''especially in plural'') Any of several inorganic salts sometimes added to bath water. ¹
2. Noun. (slang psychedelic drug culture) A class of methylenedioxypyrovalerone-based psychoactive recreational drugs. ¹
3. Noun. (slang psychedelic drug culture) By extension, a drug of that class. ¹
¹ Source: wiktionary.com