tree line tree lily • tree lizard · · · Info · Definitions · Synonyms · Characters · · tree line · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) line marking the upper limit of tree growth in mountains or northern latitudes. Synonyms: timber line, timberline, tree line. · · Noun Definition 1 Synonyms · · · timber line · · Synonym 1 timberline · · Synonym 2 Characters · · space U+0020 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074