noun
- the altitude above sea level at which timber ceases to grow.
- the arctic or antarctic limit of tree growth.
noun
- the altitudinal or latitudinal limit of normal tree growthSee also tree line
n.1867, from timber + line (n.).
- A geographic boundary beyond which trees cannot grow. On the Earth as a whole, the timberline is the northernmost or southernmost latitude at which trees can survive; in a mountainous region, it is the highest elevation at which trees can survive. Also called tree line