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Arranged or occurring in pairs; twin.

[From Greek didumos, twin; see dwo- in Indo-European roots.]
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.


(Biology) biology in pairs or in two parts
[C18: from Greek didumos twin, from duo two]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈdɪd ə məs)

adj. Bot.
occurring in pairs; paired; twin.
[1785–95; < Greek dídymos twin, double; see -ous]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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A more direct attempt to defend against asteroids is a joint European Space Agency-NASA program, the "asteroid impact and deflection assessment mission." It has actually identified a rock called 65803 Didymous that will be close enough to Earth in October 2022 to test the ability to move a near-Earth object into a different trajectory.
Due to the less electron of Cr(VI) in [Cr.sub.2][O.sub.7.sup.2-] and the didymous electron of -N[H.sub.3.sup.+], Cr(VI) reached electron from the -N[H.sub.3.sup.+].