This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, or resembling nacre (mother of pearl).

adj. Exhibiting lustrous or rainbow-like colors.

adj. Consisting of, or resembling, nacre; pearly.

Consisting of, resembling, or pertaining to nacre or mother-of-pearl: as, a nacreous luster; a nacreous layer.

Producing or possessing nacre, as shells which have a certain luster or lustrous layer on their inner surface.

In bacteriology, applied to colonies which are of a translucent, grayish-white color with a pearly luster.

adj. consisting of or resembling mother-of-pearl

adj. having a play of lustrous rainbow colors

"Unofficial Neal Asher drinking game: take a shot whenever he uses the words "nacreous" or "actinic.""

bright   

nacreous cloud    opaline    pearlescent    opalescent   

pearly   

many-rayed    numinous    aureate    blue-gold    ruddier    golden-bronze    non-luminous    wintery    epitaxial    greenish-blue