WordReference Random House Unabridged Dictionary of American English © 2020
Lewis base, [Chem.]
  1. Chemistryany substance capable of forming a covalent bond with an acid by transferring a pair of electrons to it.
  • named after German. north, northern. Lewis 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::
Lewis base n
  1. a substance capable of donating a pair of electrons to an acid to form a covalent bond
    Compare Lewis acid
Etymology: 20th Century: named after G. N. Lewis (1875–1946), US chemist
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