either of the two cylindrical projections on a cannon, one on each side for supporting the cannon on its carriage.
any of various similar supports for machinery.

1615–25; < French trognon trunk, stump, core (of fruit)

trunnioned, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trunnion (ˈtrʌnjən)
1.  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.  the structure supporting such a projection
[C17: from Old French trognon trunk]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1625, "either of two round projections of a cannon," from Fr. trognon "core of fruit, stump, tree trunk," from M.Fr. troignon (14c.), probably, from L. truncus (see trunk).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He described three types of bascule structures: trunnion, rolling lift and roller bearing.
The bridge problem involves a crack in a huge steel axle, or trunnion, at the north end of the northbound lift span.
It is a simple trunnion with a concrete counterweight set underneath the tail end.
Inspect swashplate trunnion bearings for wear and security.
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