1784, literally "rainbow-colored," coined from Latin iris (genitive iridis) "rainbow" (see iris). The verb iridesce (1868) is a back-formation. Related: Iridescently.
a dragonfly hovered, vibrating and iridescent
an iridescent oil slick
irenic
irenology
Irgun
Irian
iridescence
iridescent
iridium
iris
Irish
Irishism
Irishman
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