/ Dictionary / Index S subshell: Meaning and Definition of Find definitions for: sub•shell Pronunciation: (sub'shel"), [key] — n. Physics. a group of electrons in an atom belonging to the same shell and also having the same azimuthal quantum number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subset subshrub Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language