penetrant

[pen-i-truhnt]
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

Origin:
1535–45; < Latin penetrant- (stem of penetrāns), present participle of penetrāre to penetrate; see -ant

unpenetrant, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
penetrant (ˈpɛnɪtrənt)
 
adj
1.  sharp; penetrating
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
When the penetrant is removed from the surface, some of it remains entrapped in the discontinuities.
If the phenotype is always expressed in the presence of the genotype, the genotype is completely penetrant.
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