: a large building or floor in a building where the lines of a ship or plane are laid down full size and molds and templates made from them for structural units
* * *
a broad, roofed area where molds and patterns are prepared for construction of a ship or airplane.
[1705-15]
* * *
mold loft,
a large room (originally a loft) in which templates are drawn to full size to construct the different parts of an airplane or ship.
Useful english dictionary. 2012.