There are 2 main definitions of gray in English:

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gray1

Line breaks: gray

adjective

US spelling of grey.

Definition of gray in:

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There are 2 main definitions of gray in English:

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gray2

Line breaks: gray
Pronunciation: /ɡreɪ
 
/
(abbreviation: Gy)

noun

Physics
The SI unit of the absorbed dose of ionizing radiation, corresponding to one joule per kilogram.
Example sentences
  • The sievert is numerically equivalent to the gray for electrons and for X-rays irradiating the whole body.
  • Radiation doses are measured in rads or grays, where 1 gray equals 100 rads.
  • Thus for these particular radiations the dose equivalent in sieverts is numerically equal to the absorbed dose in grays.

Origin

1970s: named after Louis H. Gray (1905–65), English radiobiologist.

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