Sheetmetalworld.com has compiled a comprehensive glossary for the sheet metal and general manufacturing market. If we're missing some terms please feel free to use the Contact form.
Another useful glossary is the CAD CAM and Nesting glossary.
Nesting software takes a series flat patterns of parts to be cut out of sheets or rolls of material and works out the best pattern, or 'nest' in order to combine as many parts on the material with the least amount of waste. It also optimizes the cutting path to take the shortest time and generates the 'NC' (numerical control) code used to drive the CNC machine that will cut the material. More information about 'what is nesting software' is available here.