1. (n.) The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell.

2. (n.) A smooth, white, marine, gastropod shell of the genus Ovulum, resembling an egg in form.

alabaster alabastrine albescent albumen bubble caviar china cream creamy delicate dun-white egg egg white fair fish eggs flat glair glass glass house glaucescent glaucous gloss gray-white house of cards ice iridescent ivory ivory-white light lint-white matchwood mellow mother-of-pearl nacreous off-white old paper opalescent ovule pale parchment pastel patinaed pearl pearly pearly-white piecrust quiet roe sad semigloss simple sober soft soft-colored soft-hued softened somber spawn subdued subtle sweet tender vitellus white whitish whity yellow yolk