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Lewis base

noun, Chemistry.
any substance capable of forming a covalent bond with an acid by transferring a pair of electrons to it.
Origin of Lewis base
First recorded in 1960-65; named after G. N. Lewis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for Lewis base

Lewis base

a substance capable of donating a pair of electrons to an acid to form a covalent bond Compare Lewis acid
Word Origin
C20: named after G. N. Lewis (1875–1946), US chemist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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