IPA: /nəˈbjuːləˌsɪti/
KK: /nɛbjuˈlɑsɪti/
A mass of gas and dust in space that forms a nebula, or the state of being unclear or vague.
The astronomers studied the nebulosity in the distant galaxy to learn more about its formation.
Nebulosity → It is formed from "nebula" (from Latin *nebula*, meaning mist or cloud) and the suffix "-osity" (meaning quality or state of). The word "nebulosity" refers to the quality or state of being cloudy or misty.
Think of 'nebula' which means mist or cloud, and remember that 'nebulosity' describes the quality of being cloudy or misty.