Iridescent/ˌɪrɪˈdesnt/ Definition 1 of 1Pro Tip 1/3Visual Effect Describes how light reflects off a surface, causing color changes. Her iridescent necklace sparkled at different angles. Pro Tip 2/3Nature Inspired Often used to describe natural objects like feathers, scales, or shells. We marveled at the iridescent colors on the peacock's feathers. Pro Tip 3/3Not Always Bright The word can imply subtle, pearl-like lusters, not just bright, flashy colors. The iridescent soap bubble gleamed with a soft light.