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plural aftercabins
(nautical, now chiefly historical) The cabin in the stern of a vessel, typically used by the captain or senior officers. quotations
I was admitted to the after cabin where Mr Suffren was sitting at a table, having a number of papers upon it which he appeared to be inspecting […] .
1808–10, William Hickey, Memoirs of a Georgian Rake, Folio Society 1995, p. 342