Dictionary.net

• In a single-acting engine, an elongated hollow piston, open at the end, in which the end of the connecting rod is pivoted. The piston rod, crosshead and stuffing box are thus dispensed with.

2010 - New Age Dictionary Database
By Oddity Software

• In a single-acting engine, an elongated hollow piston, open at the end, in which the end of the connecting rod is pivoted. The piston rod, crosshead and stuffing box are thus dispensed with.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.