1. A light sparkling wine, usually sweet 
2. Small-scale local generation of renewable energy to supply power to a house, building or local community

Encyclopedia: Microgeneration

• underthings
• undertide
• undertone
• undertow
• undervaluation
• undervalue
• undervest
• underwater
• underwater archaeology
• underwater archeology
• underwater diver
• underway
• underwear
• underweight
• underwhelm
• underwing
• underwood
• underworld
• underwrite
• underwriter
• undescended
• undescended testicle
• undescended testis
• undescriptive
• undeserved