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

• tripodal
• tripoli
• tripos
• tripper
• trippet
• tripping
• trippingly
• trippy
• triptych
• Tripura
• triquetral
• triquetral bone
• triquetrous leek
• trireme
• trisaccharide
• trisect
• trisection
• triskaidekaphobia
• triskaidekaphobic
• triskele
• triskelion
• trismus
• trisodium orthophosphate
• trisodium phosphate
• trisomy