a substance added to another substance, as to paint or food, to increase its volume or bulk: to add cereal and soy protein to hamburger as extenders.
Photography, See under converter ( def 8 ).

1605–15; extend + -er1

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a person or thing that converts.
Electricity. a device that converts alternating current to direct current or vice versa. Compare inverter, synchronous converter.
Metallurgy. a chamber or vessel through which an oxidizing blast of air is forced, as in making steel by the Bessemer process.
Television. decoder ( def 5 ).
Radio and Television. an auxiliary device that permits a receiver to pick up frequencies or channels for which it was not originally designed.
Physics. a reactor for converting one kind of fuel into another kind.
a person who is engaged in converting textile fabrics, especially cotton cloths, from the raw state into the finished product ready for the market by bleaching, dyeing, etc.
Also called converter lens. Photography. an additional lens attached to a lens in use on a camera to alter focal length, mounted in front of a lens to produce a wide-angle effect (wide-angle converter) or between the lens and the camera body to produce a telephoto effect (teleconverter or extender)
Also, convertor.

1525–35; convert + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
converter or convertor (kənˈvɜːtə)
1.  a person or thing that converts
2.  physics
 a.  a device for converting alternating current to direct current or vice versa
 b.  a device for converting a signal from one frequency to another or from analogue to digital forms
3.  Bessemer converter See also L-D converter a vessel in which molten metal is refined, using a blast of air or oxygen
4.  short for converter reactor
5.  computing a device for converting one form of coded information to another, such as an analogue-to-digital converter
convertor or convertor

extender (ɪkˈstɛndə)
1.  a person or thing that extends
2.  a substance, such as French chalk or china clay, added to paints to give them body and decrease their rate of settlement
3.  a substance added to glues and resins to dilute them or to modify their viscosity
4.  a substance added to elastomers to assist the plasticizer
5.  printing the part of certain lower-case letters that extends either above (the ascender) or below (the descender) the body of the letter

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
converter  [%PREMIUM_LINK%]     (kən-vûr'tər)  Pronunciation Key 
  1. An electrical device that changes the form of an electric signal or power source, as by converting alternating current to direct current, or an analog signal to a digital signal. Compare rectifier, transformer.

  2. An electronic device that changes the frequency of a radio or other electromagnetic signal.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Akin to that school cafeteria meat taste unique to meat with soy filler
And, as in a hybrid electric car with a petrol-powered range extender, there is
  an internal-combustion option.
The seat-belt extender business is apparently suspicious because they could
  potentially be used as weapons.
The soup reflects the original use for pasta, which was as an extender in soups
  and sometimes desserts.
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