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Definition of Penetrance
1. n. The quality or state of being penetrant; power of entering or piercing; penetrating power of quality; as, the penetrancy of subtile effluvia.
Definition of Penetrance
1. [n -S]
Medical Definition of Penetrance
1. The proportion of individuals with a specific genotype who express that character in the phenotype. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)