I love, love, LOVE this word!
My MacbookPro dictionary gives ‘iridescent’ this meaning:
‘luminous colours that seem to change when seen from different angles’. And it’s descended from Latin, where ‘irid’ means ‘rainbow’.
(That’s also how the silvery-white metal, iridium, got its name…)
How cool is that, huh?!
Have a great day, dear Reader!