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Noun: extender  ik'sten-du(r) or ek'sten-du(r)
  1. Any device used to increase the length or reach of something
    "He used an extender to paint the high ceiling without a ladder"; "a Wi-Fi extender"
     
  2. A substance added to another to increase its volume or stretch its use
    "The paint manufacturer used an extender to make the product more economical"
     
  3. (photography) a hollow cylinder placed between a camera body and lens to increase the focal length and enable closer focusing
    "Using an extender allowed the photographer to capture extreme close-ups of small insects";
    - extension tube

Derived forms: extenders

Encyclopedia: Extender