crosshead

名词 crosshead:

1. a heading of a subsection printed within the body of the text
   同义词：crossheading
2. metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth

cross.head

n.（名词）
A beam that connects the piston rod to the connecting rod of a reciprocating engine.
十字头：连接活塞杆和往复式发动机连杆的横杆