/ Dictionary / Index L L-shell: Meaning and Definition of Find definitions for: L-shell Pronunciation: (el'shel"), [key] — n. Physics. the second shell of electrons surrounding the nucleus of an atom and containing, when filled, eight electrons having principal quantum number 2. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. L-series LSI Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language