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See green dragon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Plants) a North American aroid plant, Arisaema dracontium, having a greenish spathe and a long pointed spadix
2. (Pharmacology) the tuberous root of this plant, formerly used in medicine as an expectorant and diaphoretic
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014