extender

plural extenders

1. One who extends.

   [Marc Jacobs] is a colonialist, an extender of brands, and in very good shape.

   2010 November 10, John Caramanica, “Monopoly by Marc Jacobs”, in The New York Times

   1 more example

   The public has learned to accept the services of physician extenders as a substitute for a qualified medical doctor, but the medical profession itself will, I daresay, continue to erect substantial barriers to any policy or effort that directly affects income.

   1983 June 2, “'PHYSICIAN EXTENDERS' READY TO FILL A GAP THAT DIDN'T DEVELOP”, in The New York Times

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

   “Flour” routinely contained crushed stone or gypsum as a cheap extender.

   2018 November, Deborah Blum, “When Milk Was Full of Calf Brains”, in The Atlantic

3. Any of various components designed to extend the length of a device.
4. Any substance added to food to bulk it out, with a higher protein content than a filler.

   Soy protein is used as a meat extender.

5. climbingA runner, or quick-draw.
6. human sciencesA phrase that extends an expression to include further members of a set, e.g. "and stuff", "or something".