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A pin or gudgeon, especially either of two small cylindrical projections on a cannon forming an axis on which it pivots.
[French trognon, stump.]
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.
1. (Mechanical Engineering) one of a pair of coaxial projections attached to opposite sides of a container, cannon, etc, to provide a support about which it can turn in a vertical
2. (Mechanical Engineering) the structure supporting such a projection
[C17: from Old French trognon trunk]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. either of the two cylindrical projections on a cannon, one on each side, for supporting the cannon on its carriage.
2. any of various similar supports for machinery.
[1615–25; < French trognon trunk, stump, core (of fruit)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
trunnion[ˈtrʌnɪən] N → muñón m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005