Pronunciation: (mu&thslash;'ur-uv-pûrl'), [key]
a hard, iridescent substance that forms the inner layer of certain mollusk shells, used for making buttons, beads, etc.; nacre.
of or having the qualities of mother-of-pearl, as being iridescent or pearly: mother-of-pearl buttons.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.