Etymology
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iridescent (adj.)

1784, literally "rainbow-colored," coined from Latin iris (genitive iridis) "rainbow" (see iris). The verb iridesce (1868) is a back-formation. Related: Iridescently.

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Definitions of iridescent

iridescent (adj.)
varying in color when seen in different lights or from different angles;
a dragonfly hovered, vibrating and iridescent
Synonyms: changeable / chatoyant / shot
iridescent (adj.)
having a play of lustrous rainbow colors;
an iridescent oil slick
Synonyms: nacreous / opalescent / opaline / pearlescent
From wordnet.princeton.edu