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n. Abbr. Jy
A unit of electromagnetic flux density often used in radio astronomy, equal to 10-26 watts per square meter per hertz.

[After Karl Jansky (1905-1950), American radio engineer.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -skys
(Astronomy) a unit of flux density equal to 10–26 W m–2 Hz–1, used predominantly in radio and infrared astronomy. Symbol: Jy
[C20: named after K. G. Jansky]


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