There are 2 definitions of gray in English:


Line breaks: gray


US spelling of grey.

Definition of gray in:

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
(of an article or person) genuine, honest, true

There are 2 definitions of gray in English:


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


The SI unit of the absorbed dose of ionizing radiation, corresponding to one joule per kilogram.
More 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.


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

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