Penetrant may refer to:
- Penetrant (biochemical), a chemical that increases the ability of a poison to apply its toxic effect to a living organism
- Penetrant (mechanical, electrical, or structural), service of structural item penetrating a fire-resistance rated wall or floor assembly
- Penetrating oil, lubricant
See also
- Liquid penetrant, medium for Dye penetrant inspection
- Penetrance, in genetics, is the proportion of individuals carrying a particular variant of a gene
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