(dated, uncommon, uncountable) A pale greyish white colour, tinted with blue.
In nature we as often find the light cool as warm; also in the pictures of many of the Flemish and Dutch schools, where, as Sir Joshua himself mentions, " the silver gray or pearly is predominant, and are valued by the connoisseurs in proportion as they possess this excellence of a silver tint." 1830, John Burnet, A practical treatise on painting, page 3:
Pearly is that silky and often coloured lustre which renders of such value 1884, The popular educator, page 49:
When (the scales are) more developed and thickened, the color (pearly) is deepened, shading 1899, St. Louis medical and surgical journal, page 126:
(UK, countable, especially, plural, slang) A tooth.