Definition of eggshell:
(n) :
the
shell around an
egg; (colour) a pale
off-white colour, like that of the eggshell
(adj) :
(colour) of a pale yellowish-whitish colour, like that of the eggshell; exhibiting the thinness, translucency or near-transparency, and fragility of an eggshell; as in eggshell porcelain