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

• runner-up
• runner-up finish
• runniness
• running
• running away
• running back
• running blackberry
• running board
• running game
• running hand
• running head
• running headline
• running light
• running mate
• running noose
• running pine
• running play
• running pop
• running postman
• running shoe
• running start
• running stitch
• running suit
• running time
• running title