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Noun: impregnant
  1. A substance used to saturate or permeate something else, especially for waterproofing or strengthening
    "They applied a chemical impregnant to make the fabric water-resistant"
Adjective: impregnant
Usage: archaic
  1. Not pregnant; unfertilized or infertile
    "The impregnant female was removed from the breeding program"

Derived forms: impregnants