What is the meaning of Extender?

One who extends.

Any of various substances designed to extend any of several properties of a material.

Any of various components designed to extend the length of a device.

Any substance added to food to bulk it out, with a higher protein content than a filler.

A runner, or quick-draw.

A phrase that extends an expression to include further members of a set, e.g. "and stuff", "or something".

pre-reform spelling (used until 1943 in Brazil and 1911 in Portugal) of estender; now a common misspelling

to extend, to expand

to spread

to expand on

to stretch

Source: wiktionary.org