Suffusion

Part of speech: noun (n.)

1. The act or process of suffusing, or state of being suffused; an overspreading. To those that have the jaundice, or like suffusion of eyes, objects appear of that color. Ray.

2. That with which a thing is suffused.

3. A blending of one color into another; the spreading of one color over another, as on the feathers of birds.