anti-catalyst

an·ti·cat·a·lyst

[an-tee-kat-l-ist, an-tahy-]
noun Chemistry.
an inhibitor.

Origin:
1920–25; anti- + catalyst

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
anticatalyst (ˌæntɪˈkætəlɪst) [Click for IPA pronunciation guide]
 
n
1.  a substance that destroys or diminishes the activity of a catalyst
2.  another name for inhibitor

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Anti-catalyst is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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