nounchiefly North American
1(On a mountain) the line or altitude above which no trees grow. Also called tree line.
- Its nesting habitat is on remote, rocky ridges above the timberline.
- Above the timberline, which lies at about 10,200 feet, the habitat is alpine tundra.
- Horticulturists who hike above the timberline have noticed a remarkable phenomenon: Some of the most delicate and beautiful wildflowers grow in exposed scree.
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