Hypertext Webster Gateway: "Nebula"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Nebula \Neb"u*la\, n.; pl. {Nebul[ae]}. [L., mist, cloud; akin
to Gr. ?, ?, cloud, mist, G. nebel mist, OHG. nebul, D.
nevel, Skr. nabhas cloud, mist. Cf. {Nebule}.]
1. (Astron.) A faint, cloudlike, self-luminous mass of matter
situated beyond the solar system among the stars. True
nebul[ae] are gaseous; but very distant star clusters
often appear like them in the telescope.
From WordNet (r) 1.7 (wn)
nebula
n 1: a medicinal liquid preparation intended for use in an
atomizer
2: cloudiness of the urine
3: an immense cloud of gas (mainly hydrogen) and dust in
interstellar space
4: (pathology) a faint cloudy spot on the cornea
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