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noun, plural jan·skies.
  1. a unit of flux density for electromagnetic radiation, used chiefly in radio astronomy. Abbreviation: Jy

Origin of jansky

after K. Jansky


  1. Karl Guthe,1905–50, U.S. engineer: pioneer in radio astronomy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for jansky

Historical Examples

  • Later observers, for example Jansky and Moss, established four groups.

    The Organism as a Whole</p>

    Jacques Loeb

British Dictionary definitions for jansky


noun plural -skys
  1. a unit of flux density equal to 10 –26 W m –2 Hz –1, used predominantly in radio and infrared astronomySymbol: Jy

Word Origin

C20: named after K. G. Jansky


  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

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