1(on a mountain) the line or altitude above which no trees grow.Also called tree line
- ‘Reaching 6,755 feet above sea level, the top of the hill is above the timberline, and several plants unusual for this part of Canada grow here.’
- ‘Horticulturists who hike above the timberline have noticed a remarkable phenomenon: Some of the most delicate and beautiful wildflowers grow in exposed scree.’
- ‘Above the timberline, which lies at about 10,200 feet, the habitat is alpine tundra.’
- ‘Its nesting habitat is on remote, rocky ridges above the timberline.’
- ‘The man's trail became faint just above the timberline.’
- 1.1(in high northern (or southern) latitudes) the line north (or south) of which no trees grow.
- ‘It adopts a bushy form at the high-altitude timberline along the Andes from northern to southern Patagonia.’