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Gray

[grey] /greɪ/
noun
1.
Asa
[ey-suh] /ˈeɪ sə/ (Show IPA),
1810–88, U.S. botanist.
2.
Robert, 1755–1806, U.S. explorer and sea captain: discovered the Columbia River.
3.
Thomas, 1716–71, English poet.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for t. gray

gray1

/ɡreɪ/
adjective, noun, verb
1.
a variant spelling (now esp US) of grey
Derived Forms
grayish, adjective
grayly, adverb
grayness, noun

gray2

/ɡreɪ/
noun
1.
the derived SI unit of absorbed ionizing radiation dose or kerma equivalent to an absorption per unit mass of one joule per kilogram of irradiated material. 1 gray is equivalent to 100 rads Gy
Word Origin
C20: named after Louis Harold Gray (1905–65), English physicist

Gray

/ɡreɪ/
noun
1.
Thomas. 1716–71, English poet, best known for his Elegy written in a Country Churchyard (1751)
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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Word Origin and History for t. gray

gray

adj.

Old English græg (Mercian grei), from Proto-Germanic *grisja- "gray" (cf. Old Norse grar, Old Frisian gre, Middle Dutch gra, Dutch graw, Old High German grao, German grau), with no certain cognates outside Germanic. French gris, Spanish gris, Italian grigio, Medieval Latin griseus are Germanic loan-words.

The distinction between British grey and U.S. gray developed 20c. The noun is c.1200, from the adjective. Gray as figurative for "Southern troops in the U.S. Civil War" is first recorded 1863, in reference to their uniform color. Expression the gray mare is the better horse in reference to households ruled by wives is recorded from 1540s. The verb is 1610s (with an isolated instance from late 14c.). Related: Grayed; graying.

Online Etymology Dictionary, © 2010 Douglas Harper
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t. gray in Medicine

gray (grā)
n.
Abbr. Gy
A unit for a specific absorbed dose of radiation equal to 100 rads.

Gray (grā), Henry. 1825?-1861.

British anatomist whose work Anatomy, Descriptive and Surgical (1858), known as Gray's Anatomy, remains a standard text.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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t. gray in Science
gray
  (grā)   
The SI derived unit used to measure the energy absorbed by a substance per unit weight of the substance when exposed to radiation. One gray is equal to one joule per kilogram, or 100 rads. The gray is named after British physicist Louis Harold Gray (1905-1965).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Idioms and Phrases with t. gray
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for t. gray

gray

unit of absorbed dose of ionizing radiation, defined in the 1980s by the International Commission on Radiation Units and Measurements. One gray is equal approximately to the absorbed dose delivered when the energy per unit mass imparted to matter by ionizing radiation is one joule per kilogram. As a unit of measure, the gray is coherent with the units of measure in the International System of Units (SI). The gray replaced the rad, which was not coherent with the SI system. One gray equals 100 rads

Learn more about gray with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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