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Webster 1913 Edition

Noun.

[Cf. F.

pénétrabilité

The quality of being penetrable; susceptibility of being penetrated, entered, or pierced.

Cheyne.

Noun.

[from penetrable.] Susceptibility of being penetrated, or of being entered or passed through by another body.

There being no mean between penetrability and impenetrability.

penetrability ‎(plural penetrabilities)