Meaning of goldbeater's skin

gold'beat•er's skin"

Pronunciation: (gōld'bē"turz), [key]
  1. the prepared outside membrane of the large intestine of the ox, used by goldbeaters to lay between the leaves of the metal while they beat it into gold leaf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.