1. Of or relating to or resembling a nebula
   "the nebular hypothesis of the origin of the solar system"
   - nebulous 
2. Resembling a cloud
   - cloudlike

See also: cloudy, nebula

• optic nerve
• optic radiation
• optic tract
• optical
• optical aberration
• optical activity
• optical art
• optical bench
• optical character recognition
• optical condenser
• optical crown
• optical crown glass
• optical density
• optical device
• optical disc
• optical disk
• optical fiber
• optical fibre
• optical flint
• optical fusion
• optical glass
• optical illusion
• optical instrument
• optical lens
• optical maser