humectant

from WordNet (r) 3.0 (2006)
humectant
    n 1: any substance that is added to another substance to keep it
         moist
from The Collaborative International Dictionary of English v.0.48
Humectant \Hu*mec"tant\, a. [L. humectans, p. pr.]
   Diluent. -- n. A diluent drink or medicine. [Obs.]
   [1913 Webster]
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