Dictionary.com
Thesaurus.com

afterpeak

American  
[af-ter-peek, ahf-] / ˈæf tərˌpik, ˈɑf- /

noun

Nautical.
  1. the extreme after part of the interior of a hull, especially that part below the water immediately forward of the sternpost (opposed to forepeak).


afterpeak British  
/ ˈɑːftəˌpiːk /

noun

  1. nautical the space behind the aftermost bulkhead, often used for storage

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of afterpeak

after + peak 1