1. Suppressing or eliminating engine knock in combustion engines
   - antiknock

See also: leaded

• diaphragm
• diaphragmatic
• diaphragmatic hernia
• diaphragmatic pleurisy
• diaphyseal
• diaphysial
• diaphysis
• diapir
• diapsid
• diapsid reptile
• Diapsida
• diarchy
• diarist
• diarrhea
• diarrheal
• diarrheic
• diarrhetic
• diarrhoea
• diarrhoeal
• diarrhoeic
• diarrhoetic
• diarthrosis
• diary
• diary keeper
• Dias