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Meaning of penetrant

pen•e•trant

Pronunciation: (pen'i-trunt), [key]
— n.
  1. a person or thing that penetrates.
  2. a compound that penetrates the skin, as a lotion or cream.
  3. a substance that lowers the surface tension of water; wetting agent.
  4. a large nematocyst discharging a barbed thread that penetrates the body of the prey and injects a toxic fluid.
—adj.
  1. penetrating.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.