nebula

nebula [ NEB-yuh'-luh' ]
[ noun, adjective ]

MEANING :
1. (n.) a thinly spread cloud of interstellar dust and gas
2. (n.) a liquid medication prepared for use as a spray
3. (adj.) relating to or resembling a thinly spread cloud of interstellar dust and gas
4. (adj.) cloudy or resembling a cloud

USAGE EXAMPLE 1 :
The scientists concluded that the nebula they were studying was the result of a collapsed star.
USAGE EXAMPLE 2 :
The image, taken by NASA's space-based Chandra Observatory telescope, shows an X-ray nebula 150 light years across.