| Term: | Firn limit |
| Definition: | The minimum elevation of firn lying on a glacier surface; each year's firn line marks a glacier's annual equilibrium line; also called firn line. |
| Term: | Firn limit |
| Definition: | The lower boundary of the zone of accumulation on a glacier where snow accumulates on an annual basis. Also called the Firn Line. |
| Term: | Firn limit |
| Definition: | A synonym of firn line. |