1. A descriptive term for a visual phenomenon:
* A milky white wave: This could be a wave in the ocean that appears white due to the reflection of sunlight off the water, especially if there's a lot of foam or bubbles present.
* A wave of light: Perhaps referring to a bright, diffuse light source that seems to spread out like a wave.
2. A specific event or phenomenon:
* A cultural or religious reference: It's possible it's a term specific to a particular culture or belief system, perhaps a religious phenomenon or legend.
3. A figurative expression:
* A metaphor: "Milky wave" might be used metaphorically to describe a surge or influx of something, like a wave of emotion or a wave of people.
To understand the meaning of "milky wave" you need more context. Please provide more information about where you encountered this term.