pushrod

Short definition from Wiktionary

Noun

1. 1
   A rigid reciprocating rod that, by its movement, transmits force to actuate a mechanism: A rod in a piston engine that actuates rocker arms above the cylinder head.
2. 2
   A rigid reciprocating rod that, by its movement, transmits force to actuate a mechanism: A rod in an internal gear hub that actuates the shifting mechanism.
3. 3
   A rigid reciprocating rod that, by its movement, transmits force to actuate a mechanism: A rod used in the transmission of flight control inputs to an aircraft's control surfaces.