Definition of groundline 

1a : strong hard-laid line that is used to form the main line of a setline and is usually provided in bundles of 300 fathoms weighing 48, 40, or sometimes 32 pounds

b : the main line of a setline consisting of one or more bundles of groundline

2a : the baseline which represents a ground plane in pictures having no indication of spatial depth and upon which all figures and objects are placed irrespective of their real spatial relationship

b : the bottom line of the picture plane of a drawing in linear perspective

c : the bottom line of a photograph

d : the line representing ground level in an architectural plan or drawing

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