nebula has definitions from the fields of astronomy,pathology,medicine,chemistry
1
[ noun ] (pathology) a faint cloudy spot on the cornea

Related terms

spot pathology

2
[ noun ] (medicine) cloudiness of the urine

Related terms

symptom

3
[ noun ] (chemistry) a medicinal liquid preparation intended for use in an atomizer

Related terms

formulation

4
[ noun ] (astronomy) an immense cloud of gas (mainly hydrogen) and dust in interstellar space
*