Definitions for "Snowline"
The lowest point at which snow remains year-round.
The line on a glacier separating the area where snow remains from year to year from the area where snow from the previous season melts.
the elevation above which snow remains on the ground year-round, ie the lower boundary of a permanent snowcap. Sometimes also used to designate the lower elevation boundary of merely seasonal snowfields.
In astronomy, a snowline is a theoretical distance from a star that, during the system's formation, material must orbit outside of in order for a planet core to form.