eggshell

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The thin, often brittle exterior covering of the egg of a bird or reptile.
• noun A pale yellow to yellowish white.
• noun A kind of paint that dries to a finish having very little shine.

from The Century Dictionary.

• noun The shell or outside covering of an egg: chiefly said of the hard, brittle, calcareous covering of birds' eggs.

from the GNU version of the Collaborative International Dictionary of English.

• noun The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell.
• noun (Zoöl.) A smooth, white, marine, gastropod shell of the genus Ovulum, resembling an egg in form.
• adjective of a pale, yellowish-white color.
• adjective (Architecture) having a smooth but not glossy texture like that of a hen's egg. Also referred to as matte glaze or non-lustrous glaze.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The shell around an egg.
• noun A pale off-white colour, like that of the eggshell.
• adjective Of a pale yellowish-whitish colour, like that of the eggshell.
• adjective Exhibiting the thinness, translucency or near-transparency, and fragility of an eggshell; as in eggshell porcelain.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the exterior covering of a bird's egg