carbanion

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car·ban·i·on

 (kär-băn′ī′ən, -ī′ŏn′)
n.
An anion in which carbon carries a negative charge and an unshared pair of electrons.
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.

carbanion

(kɑːˈbænaɪən)
n
(Chemistry) a negatively charged organic ion in which most of the negative charge is localized on a carbon atom. Compare carbonium ion
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014