/ Dictionary / Index U undergrown: Meaning and Definition of Find definitions for: un•der•grown Pronunciation: (un'dur-grōn", un"dur-grōn'), [key] — adj. not grown to normal size or height: sickly and undergrown cattle. having an undergrowth: an undergrown thicket tangled with creeping vines. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. underground trolley undergrowth Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language