quadruplet

One of four offspring born in a single birth.

A group or combination of four associated by common properties or behavior.

A group of four notes having the time value of three notes of the same kind.

Any combination of four objects or parts grouped, united, or acting together: as, a quadruplet of springs, consisting of four elliptic springs coupled together and acting as one spring. Also called quartet.

One of four born at a single birth.

A bicycle for four riders.

In music, same as quartole.

A collection or combination of four of a kind.

Four children born in the same labor.

A cycle for carrying four riders, so arranged that all the riders can assist in the propulsion.