deflator

from WordNet (r) 3.0 (2006)

deflator
    n 1: a statistical factor designed to remove the effect of
         inflation; inflation adjusted variables are in constant
         dollars

from The Collaborative International Dictionary of English v.0.48

deflator \deflator\ n.
   a statistical factor designed to remove the effect of
   inflation; inflation adjusted variables are in constant
   dollars; as, the GNP deflator..
   [WordNet 1.5]