1) A building in which malt is prepared.
It occurs most commonly as a by-name or minor place-name: 1324-5 pro ponte ultra le Malthousbek faciendo xxs, Bolton Priory
1379 Thomas de Malthous, Kirkby Malzeard
1426-7 William del Malthous, ‘keeper of the malt-house ... and rabbit warren of Thorpe Willoughby’. See GRDict.