English Noun malt house (plural malt houses) Alternative form of malthouse. 2023 June 28, Stephen Roberts, “Bradshaw's Britain: Alton to Exeter”, in RAIL, number 986, page 59:Population 5,430 (more like 40,000 today), Andover is "a bustling agricultural town" with "many malt houses, and a factory for silk shag".Wikiwand - on Seamless Wikipedia browsing. On steroids.