1. Consisting of or resembling mother-of-pearl 
2. Having a play of lustrous rainbow colours
   "nacreous clouds looking like mother-of-pearl"
   - iridescent, opalescent, opaline, pearlescent

See also: bright, nacre

• yon
• yond
• yonder
• yoni
• yonks
• yoo-hoo
• yoof
• yore
• York
• yorker
• Yorkshire
• Yorkshire and the Humber
• Yorkshire fog
• Yorkshire pudding
• Yorkshire terrier
• Yorkshireman
• Yorkshirewoman
• Yorktown
• Yoruba
• Yosemite
• Yosemite Falls
• Yosemite National Park
• Yosemite toad
• yottabit
• yottabyte