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1the thin, hard outer layer of an egg, especially a hen’s egg: Emily was peeling off her eggshell [mass noun]: pieces of eggshell are being examined to study possible contamination
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2 [as modifier] (of china) of extreme thinness and delicacy: eggshell porcelains
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3 [mass noun] (also eggshell paint) a paint that dries with a slight sheen: the woodwork was painted in eggshell [as modifier]: an eggshell finish