Nĕb'ū-lă or NĒB'Ū-LĒ, n.
n.; pl. NĒB'Ū-LĒ. [Lat. nebula, mist, vapor, cloud, allied to nubes, cloud; Gr. νεφέλη, νέφος, cloud, mist; N. H. Ger. nebel, O. H. Ger. nebel, nepel, O. Sax. nebhal, Goth. nibils, D. nevel, Icel. nefel, Skr. nabhas, air, sky; Russ. nebo, sky; W. nef, Ir. neamh, heaven, neul, cloud.]
Sense 1. (Astron.) A faint, misty appearance seen among the stars, resembling a speck of fog, and, in most cases, shown by the telescope to be composed of innumerable stars.
Sense 2. (Med.) (a.) A white spot, or a slight opacity of the cornea. (b.) A cloudy appearance in the urine. Dunglison.
Sense 3. (Her.) A line drawn with undulations resembling the form of clouds; or a shield or charge divided by several such lines drawn across it.