1. An excess of artificial light, especially near urban developments, reducing visibility of stars etc. in the night sky

Encyclopedia: Light pollution

• Sverige
• Svizzera
• svoboda
• SVR
• SW
• swab
• swabbing
• swad
• dwindling
• dwindling away
• Dy
• dyad
• dyadic
• dyadic operation
• dyarchy
• Dyaus
• Dyaus-pitar
• dybbuk
• dye
• dye-works
• dyed
• dyed-in-the-wool
• dyeing
• dyer
• dyer's greenweed