From Longman Dictionary of Contemporary EnglishPortakabinPor‧ta‧kab‧in /ˈpɔːtəkæbɪn $ ˈpɔːr-/ noun [countable] trademark British English TBBTBCa very small building that can be used as a temporary office, classroom etc, and can be moved by truck
Examples from the Corpus
Portakabin• This time we really thought we had lost her, but some time later we saw her crawl underneath my Portakabin.• Ostermeier worked at the Baracke, a complex of Portakabins that the prestigious Deutsches Theater had lent him.• Was it any wonder I resorted to the drinks cabinet in the director's Portakabin? 