designer drugs

/D IH0 Z AY1 N ER0 D R AH0 G Z/
noun
  1. 1

    A drug specifically developed to replace an illegal recreational drug (so as to circumvent existing drug laws), usually by modifying its molecular structure.

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Source: https://en.wiktionary.org/wiki/designer%20drug, https://en.wiktionary.org/wiki/designer%20drugs