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gray1 / grā/ (Brit. grey) • adj. 1. of a color intermediate between black and white, as of ashes or an overcast sky: gray flannel trousers. ∎  (of hair) turning gray or white with age: a gray beard. ∎  (of a person) having gray hair: a gray, fatherly gentleman. ∎ inf. relating to old people, esp. when seen as an oppressed group: gray power. ∎  (of the weather) cloudy and dull; without sun: a cold, gray November day. ∎  (of a person's face) pale, as through tiredness, age, or illness: a few people, their faces gray and bitter. 2. dull and nondescript; without interest or character: gray, faceless men the gray daily routine. 3. (of financial or trading activity) not accounted for in official statistics: the gray economy. • n. 1. gray color or pigment: dirty intermediate tones of gray. ∎  gray clothes or material: the gentleman in gray. ∎  gray hair: he sighed at the amount of gray at his temple. ∎  (usu. Gray) the Confederate army in the Civil War, or a member of that army. 2. a gray thing or animal, in particular a gray or white horse. • v. [intr.] (esp. of hair) become gray with age: he had put on weight and grayed somewhat | [as adj.] (graying) a man of about fifty with graying hair. ∎  (of a person or group) become older; age: [as adj.] (graying) a graying workforce. PHRASAL VERBS: gray something out display a menu option in a light font to indicate that it is not available: [usually passive] all the property fields on the Shortcut tab are either missing or grayed out.DERIVATIVES: gray·ish adj. gray·ly adv. gray·ness n. gray2 (abbr.: Gy) • n. Physics the SI unit of the absorbed dose of ionizing radiation, corresponding to one joule per kilogram.

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gray Symbol Gy. The derived SI unit of absorbed dose of ionizing radiation (see radiation units). It is named after the British radiobiologist L. H. Gray (1905–65).

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gray(Gy) The SI unit of absorbed radiation dose, being an energy of 1 joule imparted by ionizing radiation to 1 kilogram of matter. It is named after the British radiologist L. H. Gray (1905–65).

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gray (gray) n. the SI unit of absorbed dose of ionizing radiation, being the absorbed dose when the energy per unit mass imparted to matter by ionizing radiation is 1 joule per kilogram. It has replaced the rad. Symbol: Gy.

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Gray (Gy) The SI unit for ionizing radiation (= 100 rad), equivalent to 1 J/kg.

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gray (symbol Gy) SI unit of absorbed radiation dose. One gray is equivalent to supplying 1 joule of energy per kilogram of irradiated material. It superseded the rad (1 gray = 100 rad).

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gray see GREY.
Hence grayling fish of silvergrey colour. XV.