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Pronunciation: poy'zon


  1. Any substance, either taken internally or applied externally, injurious to health or dangerous to life.
  2. A substance that inhibits a chemical reaction or inactivates a catalyst.

[Fr., fr. L. potio, potion, draught]

Further information

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.