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

British Dictionary definitions for lewis base

Lewis base

noun

a substance capable of donating a pair of electrons to an acid to form a covalent bond Compare Lewis acid

Word Origin for Lewis base

C20: named after G. N. Lewis (1875–1946), US chemist