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emitter

American  
[ih-mit-er] / ɪˈmɪt ər /

noun

  1. a person or thing that emits.

  2. Electronics. an electrode on a transistor from which a flow of electrons or holes enters the region between the electrodes.


emitter British  
/ ɪˈmɪtə /

noun

  1. a person or thing that emits

  2. a radioactive substance that emits radiation

    a beta emitter

  3. the region in a transistor in which the charge-carrying holes or electrons originate

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of emitter

First recorded in 1880–85; emit + -er 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

In China, however, ELI hasn’t been training litigators and judges to pursue comparable strategies against the world’s largest emitter of greenhouse gases.

From The Wall Street Journal Jul. 27, 2026

China is the world's biggest emitter of greenhouse gases, but it is also a global renewable energy powerhouse that aims to make its massive economy carbon-neutral by 2060.

From Barron's Jul. 7, 2026

They identified a molybdenum-based "spin-flip" emitter as an effective solution.

From Science Daily Mar. 28, 2026

While the sector is still a relatively small emitter compared to other industries, it is having an outsize impact because of how fast its emissions are growing, the analysis found.

From Barron's Feb. 12, 2026

“But you can use it to make a different type of emitter for sympathy lamps. You get a bluish light instead of the ordinary red. A little easier on the eyes. Fetch outrageous prices.”

From "The Name of the Wind" by Patrick Rothfuss

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