nacreous cloud nacreous • nacrine · · · Info · Definitions · Synonyms · Characters · · nacreous cloud · · Text Common · · Latin · · Scripts 14 · · Length 3 · · Syllables Definitions · · · (noun) a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon. Synonyms: nacreous cloud, mother-of-pearl cloud. · · Noun Definition 1 Synonyms · · · mother-of-pearl cloud · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075