Definition of "extender"

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

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

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

(climbing) A runner, or quick-draw.  examples

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