Definition of "cambouse"

On the second day out, while sailing moderately on our course in the Gulf Stream, a sudden squall of wind struck the ship from the SW. and knocked her completely on her beam-ends, stove one of our boats, entirely destroyed two others, and threw down the cambouse.

1832, Owen Chase, chapter 9, in Narrative of the Most Extraordinary and Distressing Shipwreck of the Whale-Ship Essex …