パチンコ

Etymology
Appears from the in the early 1900s.

Compound of.

A pinball-like children's game was first called of similar derivation, with this more gambling-oriented machine becoming popular from around 1947.

Noun

 * 1) a form of vertical pinball used for gambling, sometimes found in arcades
 * 2) a slingshot, stonebow
 * 3)  a pistol

Usage notes
The slingshot sense may be more commonly spelled in hiragana, as.