1. in a manner showing a play of colors like that of an opal; with a shimmering, iridescent quality

Examples

• The soap bubble floated opalescently in the afternoon sunlight.
• The oil slick spread opalescently across the water's surface.
• Her dress shimmered opalescently as she moved across the stage.
• The mother-of-pearl inlay caught the light opalescently.
• The aurora borealis danced opalescently across the Arctic sky.