1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Trunnion  \Trun"nion\,  n.  [OF.  trognon  the  stock,  stump,  or  truck 
  of  a  tree,  F.  trognon  a  core,  stalk,  fr  tron  a  trunk,  stem. 
  Cf  {Trunk}.] 
  1.  (Gun.)  A  cylindrical  projection  on  each  side  of  a  piece, 
  whether  gun,  mortar,  or  howitzer,  serving  to  support  it  on 
  the  cheeks  of  the  carriage.  See  Illust.  of  {Cannon}. 
 
  2.  (Steam  Engine)  A  gudgeon  on  each  side  of  an  oscillating 
  steam  cylinder,  to  support  it  It  is  usually  tubular,  to 
  convey  steam. 
 
  {Trunnion  plate}  (Gun.),  a  plate  in  the  carriage  of  a  gun, 
  mortar,  or  howitzer,  which  covers  the  upper  part  of  the 
  cheek,  and  forms  a  bearing  under  the  trunnion. 
 
  {Trunnion  ring}  (Gun.),  a  ring  on  a  cannon  next  before  the 
  trunnions.  [R.] 

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