[Fr.] In sheet-glass making: A sheet of perfectly smooth glass, placed between the flattening stone and the cylinder to be flattened.
1883. H. Chance, Princ. Glassmaking, 129. The flattening-stone, from the slight irregularities of whose surface it is protected by a lagre or sheet of glass laid upon the stone.
1890. W. J. Gordon, Foundry, 148. In his furnace is a stone with a piece of glass on it; upon this so-called ‘lagre’ the cylinder lies with its split side uppermost.
