penetrant: Meaning and Definition of

pen•e•trant

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.

1. penetrating.