en.wikipedia.org/wiki/Grey_literature

Grey literature (or gray literature) are materials and research produced by organizations ... The U.S. Interagency Gray Literature Working Group (IGLWG), in its "Gray Information Functional Plan" of 1995, defined grey literature as "foreign or ...

www.dictionary.com/e/gray-or-grey

Both spellings evolved from the Old English term grǣg and have retained their primary definition as a color, but many people have sought to assign gray and ...

www.dictionary.com/browse/gray

Gray definition, of a color between white and black; having a neutral hue. See more.

www.merriam-webster.com/dictionary/gray

Gray definition is - of the color gray. How to use gray in a sentence.

www.urbandictionary.com/define.php?term=Gray

Gray's are usually very open and accept you for who you are. ... If you're lucky enough to meet a Gray, she is truly worth getting to know because ... Top definition.

www.merriam-webster.com/dictionary/grey

Grey definition is - of the color gray. How to use grey in a sentence.

dictionary.cambridge.org/us/dictionary/english/gray

gray meaning: 1. US spelling of grey 2. a unit of measurement for absorbed radiation 3. (of) the color that is a mixture of black and white, the color of clouds when ...

en.oxforddictionaries.com/definition/gray

Definition of gray - ... Main definitions of gray in English. : graygray ... Origin. 1970s: named after Louis H. Gray (1905–65), English radiobiologist.

www.vocabulary.com/dictionary/gray

Because the color gray is between black and white — actually a mix of the two — it is often used to denote something dull or monotonous. When the sun comes ...