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Online Etymology Dictionary, © 2010 Douglas Harper
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The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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The American Heritage® Abbreviations Dictionary, Third Edition
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