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The Collaborative International Dictionary
Penetrable

Penetrable \Pen"e*tra*ble\, a. [L. penetrabilus: cf. F. p['e]n['e]trable.] Capable of being penetrated, entered, or pierced. Used also figuratively.

And pierce his only penetrable part.
--Dryden.

I am not made of stones, But penetrable to your kind entreats.
--Shak. [1913 Webster] -- Pen"e*tra*ble*ness, n. -- Pen"e*tra*bly, adv.

Douglas Harper's Etymology Dictionary
penetrable

early 15c., "penetrating," from Latin penetrabilis "penetrable, vulnerable," from penetrare (see penetrate). Meaning "capable of being penetrated" is attested from 1530s; figurative use by 1590s. Related: Penetrability.

Wiktionary
penetrable

a. Capable of being penetrated, entered, or pierced.

WordNet
penetrable
  1. adj. admitting of penetration or passage into or through; "a penetrable wall"; "penetrable defenses" [ant: impenetrable]

  2. capable of being penetrated; "penetrable defenses"

Usage examples of "penetrable".

She was waiting in the exact spot in which he left her when he got back, seemingly paralyzed by the un penetrable blackness that had surrounded her.