IPA: /ˌɪrɪˈdɛsəns/
KK: /ˌɪrɪˈdɛsəns/
The quality of showing many different colors that seem to change when viewed from different angles.
The iridescence of the soap bubble made it look magical in the sunlight.
Iridescence → It is formed from "iris" (from Latin *iris*, meaning rainbow) and "-escent" (from Latin *escentem*, meaning becoming). The word describes the quality of becoming like a rainbow, exhibiting a spectrum of colors that change when viewed from different angles.
Think of the word 'iris' which relates to a rainbow, and remember that 'iridescence' means the quality of showing rainbow-like colors.