penetrant

noun

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. Zoology. a large nematocyst discharging a barbed thread that penetrates the body of the prey and injects a toxic fluid.

adjective

5. penetrating.

adjective

1. sharp; penetrating

noun

2. chem a substance that lowers the surface tension of a liquid and thus causes it to penetrate or be absorbed more easily
3. a person or thing that penetrates