Also found in: Thesaurus, Wikipedia.
A gun or cannon mounted on the stern of a ship for firing at a pursuing vessel.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a gun mounted at the stern of a sailing ship, pointing aft.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.