Webster's English Dictionary

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nebula

neb.u.la \'neb-y*-l*\ \-.le-, -.li-\ \-l*r\ n or nebulas or neb.u.lae [NL, 
   fr. L, mist, cloud; akin to OHG nebul fog, Gk nephele-, ] pl nephos cloud 
   1: a slight cloudy opacity of the cornea  2a: any of many immense bodies of 
   highly rarefied gas or dust in interstell ar space 2b: GALAXY; specif : a 
   galaxy outside the Milky Way galaxy  - neb.u.lar aj