The croquet start line is called a baulk line.
It is called the "ordinate" axis.
The middle of a line segment is called a Midpoint.;-)
line segment
A line.
The line on a mountain above which trees do not grow is called the tree line. It is sometimes called the timber line as well.
timber line: line marking the upper limit of tree growth in mountains or northern latitudes
It depends on the density of the timber.
Lumber
The point on a mountain beyond which trees cannot grow is called the tree line or timberline. This is typically determined by factors such as temperature, altitude, and soil conditions. Above this line, environmental conditions become too harsh for trees to survive.
You hang it out on the line after washing in the washing machine
naturists resort
It is the elevation above which trees won't grow.
Second-hand timber. Often called "reclaimed" timber.
Above the timber line is the alpine zone. This zone is an area in which trees cannot grow because the altitude makes it too cold for the trees to survive.
planed
bodar