[ˈnɛbjʊlə], (Noun)

Definitions:
- a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter

- a clouded spot on the cornea causing defective vision


Phrases:

Origin:
mid 17th century (as a medical term): from Latin, literally ‘mist’