nimbus
\NIM-buhs\, noun:
1. (Fine Arts) A circle, or disk, or any indication of radiant light around the heads of divinities, saints, and sovereigns, upon medals, pictures, etc.; a halo.
2. A cloud or atmosphere (as of romance or glamour) that surrounds a person or thing.
3. (Meteorology) A rain cloud.
Sometimes when she stood in front of a lamp, the highlights on her hair made a nimbus.