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jansky

1 American  
[jan-skee] / ˈdʒæn ski /

noun

Astronomy.
janskies plural
  1. a unit of flux density for electromagnetic radiation, used chiefly in radio astronomy. Jy


Jansky 2 American  
[jan-skee] / ˈdʒæn ski /

noun

  1. Karl Guthe, 1905–50, U.S. engineer: pioneer in radio astronomy.


Jansky 1 British  
/ ˈdʒænskɪ /

noun

  1. Karl Guthe 1905–50, US electrical engineer. He discovered a source of radio waves outside the solar system (1932) and pioneered radio astronomy

"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

jansky 2 British  
/ ˈdʒænskɪ /

noun

  1.  Jy.  a unit of flux density equal to 10 –26 W m –2 Hz –1 , used predominantly in radio and infrared astronomy

"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

Other Word Forms

Noun Inflected Forms

Etymology

Origin of jansky

After K. Jansky

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:

Radio observations from the Karl G. Jansky Very Large Array near San Agustin, New Mexico revealed a pair of massive plasma jets emerging from opposite sides of the galaxy.

From Science Daily Jan. 10, 2026

An upgraded “next generation” version of the Karl G. Jansky Very Large Array of radio telescopes in New Mexico could begin operations toward the end of the 2020s and settle the debate.

From Scientific American Apr. 5, 2022

Kurczy grounds readers with a brief but compelling history of radio astronomy: In 1931, scientist Karl Jansky accidentally discovered radio waves from space and presented his findings two years later.

From Salon Oct. 9, 2021

Her name was Jeannette Jansky and it wasn’t until years later I realized I had a mild form of dyslexia and she was a well-respected expert on child learning disabilities.

From New York Times Sep. 16, 2021

Subsequent investigation showed that the source of this radiation was part of the Milky Way Galaxy; Jansky had discovered the first source of cosmic radio waves.

From Textbooks Oct. 13, 2016

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