penetrable
American Heritage Dictionary:
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pen·e·tra·ble
(pĕn'ĭ-trə-bəl) 
adj.
Capable of being penetrated: penetrable defenses; a penetrable wall.
penetrability pen'e·tra·bil'i·ty n.
penetrably pen'e·tra·bly adv.
adj.
Capable of being penetrated: penetrable defenses; a penetrable wall.
penetrability pen'e·tra·bil'i·ty n.
penetrably pen'e·tra·bly adv.
Antonyms by Answers.com:
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penetrable
adj
Definition: permeable
Antonyms: impenetrable, impervious
adj
Definition: understandable
Antonyms: incomprehensible
Mosby's Dental Dictionary:
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penetrability
(pen′ə-trə-bil′i-tē)
n
n
The ability of a beam of x-radiation to pass through matter. The degree of penetrability is determined by kilo-voltage and filtration.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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