represser

from WordNet (r) 3.0 (2006)
represser
    n 1: an agent that represses [syn: {repressor}, {represser}]
    
from The Collaborative International Dictionary of English v.0.48
Represser \Re*press"er\ (-?r), n.
   One who, or that which, represses.
   [1913 Webster]
    

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