nutgall
American Heritage Dictionary:
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nut·gall
(nŭt'gôl') 
n.
A nutlike swelling produced on an oak or other tree by certain parasitic wasps. Also called gallnut.
n.
A nutlike swelling produced on an oak or other tree by certain parasitic wasps. Also called gallnut.
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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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