timberline

Definition of Timberline in English :

1. timber line, timberline, tree line

line marking the upper limit of tree growth in mountains or northern latitudes

WordNet Lexical Database for English. Princeton University. 2010.

Timberline

noun

the altitudinal or latitudinal limit of normal tree growth

noun

any natural division above or beyond which trees do not grow, as on mountains or in polar regions

n.

1. The elevation in a mountainous region above which trees do not grow.

2. The northern or southern latitude beyond which trees do not grow. In both senses also called tree line.