1. (informal) anything complex, detailed or confusing 
2. The science or study of rockets and their design

Encyclopedia: Rocket science

• kilohertz
• kilojoule
• kiloliter
• kilolitre
• kilometer
• kilometers per hour
• kilometre
• kilometres per hour
• kiloton
• kilovolt
• kilovolt-ampere
• kilowatt
• kilowatt hour
• Kilroy
• kilt
• kilted
• kilted up
• kilter
• kiltie
• Kim Campbell
• Kimberley
• kimberlite
• kimchi
• Davalia bullata mariesii
• davallia