English
groundline
From ground + line.
Proto-Indo-European *gʰrem- ‘floor, settlement’
Proto-Germanic *grunduz ‘ground, foundation’
Proto-West Germanic *grundu
Old English grund
Middle English ground
English ground
Proto-Germanic *līną ‘flax’
Proto-Germanic *līnǭ ‘line’
Proto-West Germanic *līnā ‘line’
Old English līne ‘line’
Middle English line ‘rope’
English line
Today it means
noun A line drawn to signify the surface of the ground, especially in architectural blueprints and in drawings by children which lack dimension.
Language periods are conventional ranges, not dates for this word.
Etymograph / groundline