Verb: opalesce ,ow-pu'les- Exhibit a play of colours like that of an opal
"This nitrate opalesces under certain conditions"
- Reflect light or colours like an opal
"Distant clouds opalesce like pale brocade"; "raindrops caught in a sunbeam seem to opalesce"
Derived forms: opalesced, opalesces, opalescing
Type of: iridesce [formal], reflect, shine