Definition of "penetrant" [pen•e•trant]

• Penetrating; piercing: a penetrant wind from the north. (adjective)
• Something that penetrates or is capable of penetrating. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "“Reconstruit les cheveux abimes en penetrant dans la tige capillaire, optimisant ainsi la cohesion et la revitalization.”"
• "Whole-brain radiation treatment—highly penetrant X-rays dosed directly through her skull—would also be used prophylactically against leukemia growth in her brain."
• "Is it poor maintenance or airliners can't be taken out of service for a proper inspection, including non destructive such as dye penetrant and x-ray?"