Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
nacreous is an adjective meaning "consisting of or resembling mother-of-pearl". It carries 2 recorded senses.
consisting of or resembling mother-of-pearl
having a play of lustrous rainbow colors
“an iridescent oil slick”
“nacreous (or pearlescent) clouds looking like mother-of-pearl”
“a milky opalescent (or opaline) luster”
Definitions, synonyms and semantic relations for nacreous come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.