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Having six stamens, four of which are longer than the others, as in most plants of the mustard family.
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.
(Botany) (of plants) having six stamens, two of which are shorter than the others
[C19: from tetra- + Greek dunamis power]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
tet•ra•dy•na•mous(ˌtɛ trəˈdaɪ nə məs)
having four long and two short stamens, as a flower of the mustard family.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.