Etymology
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penetrable (adj.)

early 15c., "penetrating" (a sense now rare or obsolete), from Latin penetrabilis "penetrable, vulnerable," from penetrare (see penetrate). Meaning "capable of being entered or pierced by another body" is attested from 1530s; figurative use by 1590s. Related: Penetrability.

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Definitions of penetrable

penetrable (adj.)
admitting of penetration or passage into or through;
a penetrable wall
penetrable defenses
penetrable (adj.)
capable of being penetrated;
penetrable defenses
From wordnet.princeton.edu