an·ti·cat·a·lyst 
(ăn′tē-kătl-ĭst, ăn′tī-)
(ăn′tē-kătl-ĭst, ăn′tī-)n.
1. A substance that retards or arrests a chemical reaction.
2. A substance that reduces or destroys the effectiveness of a catalyst.
- supererogatory
- superfamily
- superfast
- super featherweight
- superfecta
- superfecundation
- superfetate
- superfetation
- superficial
- superficiality
- superficially
- superficialness
- superficies
- superfine
- superfineness
- superfluid
- superfluidity
- superfluity
- superfluous
- superfluously
- superfluousness
- super flyweight
- super G
- supergalaxy
- supergene