2. the front part of a merchant ship, where the crew's quarters are located
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'forecastle' fore
: from the foremost of the two castlelike structures on the hull of a medieval vessel