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

Encyclopedia: Rocket science

• trench fever
• trench foot
• trench knife
• trench mortar
• trench mouth
• trench warfare
• trenchancy
• trenchant
• trenchantly
• trencher
• trencherman
• trenching spade
• trend
• trend analysis
• trend line
• trend-setter
• trendily
• trendiness
• trendsetting
• trendy
• Trent
• Trent River
• Trental
• trente-et-quarante
• Trentino-Alto Adige