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Webster 1913 Edition

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Noun.

The quality or state of being penetrant; power of entering or piercing; penetrating power or quality;

as, the

penetrancy

of subtile effluvia

Noun.

[L. penetrans.] Power of entering or piercing; as the penetrancy of subtil effluvia.

penetrancy ‎(countable and uncountable, plural penetrancies)

The quality or state of being penetrant; penetrance.
the penetrancy of subtile effluvia