Pronunciation: (fōk'sul, fôr'kas"ul, -kä"sul, fōr'-),[key] —n.Naut. 1. a superstructure at or immediately aft of the bow of a vessel, used as a shelter for stores, machinery, etc., or as quarters for sailors.
2. any sailors' quarters located in the forward part of a vessel, as a deckhouse.
3. the forward part of the weather deck of a vessel, esp. that part forward of the foremast. Also,fo'c's'le,fo'c'sle.