From Longman Dictionary of Contemporary Englishblockhouseblock‧house /ˈblɒkhaʊs $ ˈblɑːk-/ noun [countable] PMa small strong building used as a shelter from enemy guns
Examples from the Corpus
blockhouse• On the side of the shed was a blockhouse canteen and some offices.• Anticipating the attacks, de Lattre had strengthened the Red River valley with hundreds of cement blockhouses and new airfields.• Petion had to duck as he preceded the Doctor into an adobe-style blockhouse, which was refreshingly cool inside.• Jackie Whites for chub from the blockhouse, with one or two good roach bags around the outfall. 