Definify.com
Webster 1828 Edition
Nebulab
NEBULAB
,Noun.
1.
A dark spot, a film in the eye, or a slight opacity of the cornea.2.
In astronomy, a cluster of fixed stars, not distinguishable from each other or scarcely visible to the naked eye, and exhibiting a dim hazy light, appearing like dusky specks or clouds through the telescope.