Definition from Wiktionary, the free dictionary
mother-of-pearl (not comparable)
the hard pearly inner layer of certain mollusk shells
- (noun) pearl
- “mother-of-pearl” in The American Heritage® Dictionary of the English Language, Fourth Edition, Houghton Mifflin Company, 2000.
- “mother-of-pearl” in Dictionary.com Unabridged, v1.0.1, Lexico Publishing Group, 2006.
- "mother-of-pearl" in On-line Medical Dictionary, University of Newcastle upon Tyne, 1997–2005.
- "mother-of-pearl" in WordNet 2.0, Princeton University, 2003.