/ Dictionary / Index T timberline: Meaning and Definition of Find definitions for: tim•ber•line Pronunciation: (tim'bur-līn"), [key] — n. the altitude above sea level at which timber ceases to grow. the arctic or antarctic limit of tree growth. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: timberline (Thesaurus) timberland timberman Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language