Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class III. Words Relating to Matter
Section III. Organic Matter
2. Sensation
(ii) Specific Light

432. Gray.

   NOUN:GRAY or grey &c. adj.; neutral tint, silver, dove-color, pepper and salt, chiaroscuro [It.], grisaille.
  grayness or greyness &c. adj.
  [PIGMENTS] Payne’s gray; black [See Blackness].
   VERB:RENDER GRAY &c. adj.; gray or grey.
   ADJECTIVE:GRAY or grey; iron-gray, dun, drab, dingy, leaden, livid, somber, sad, pearly, calcareous, limy, silver, silvery, silvered; French -, steel -, Quaker -, dapple- gray; dappled; dove-colored, gorge-de-pigeon [F.]; ashen, ashy, favillous; cinereous, cineritious; grizzly, grizzled; slate-colored, stone-colored, mouse-colored, ash-colored; cool.