Definition:Cord (Physics)

Definition
A cord is an inelastic thread whose mass, stiffness and width are approximated to zero.

That is, it is a chain whose mass is zero.

Also known as
To emphasize its masslessness, it is often referred to as a light cord.

However, this can be misinterpreted, as in common parlance it usually means the device used to operate a ceiling-mounted switch for controlling domestic illumination.

Some interpretations give this as thread, but the latter is used on to denote a similarly-configured body which is not inelastic.