matchboard

1. (злічуване, незлічуване)A type of wooden board that connects with others using a tongue and groove system

   a board that has a groove cut into one edge and a tongue cut into the other so they fit tightly together (as in a floor)

2. (злічуване, незлічуване)A thin piece of material (such as wood, plaster, or metal) that forms and aligns the matched parting surfaces for the two parts (the cope and the drag) of a molding box or flask, to which board patterns are attached in some casting methods.

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