#accelerator__catalyst  (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
  exclusion:  #anticatalyst
  supertype:  #activator  any agency bringing about activation; (biology) a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription
  subtype:  #biocatalyst  a biochemical catalyst such as an enzyme
  subtype:  #platinum_black  a fine black powder of platinum; used as a catalyst in chemical reactions

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