annulation
American Heritage Dictionary:
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an·nu·la·tion
(ăn'yə-lā'shən) 
n.
n.
- The act or process of forming rings.
- A ringlike structure, segment, or part.
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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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Mentioned in
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