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

See also: leaded

• spider fern
• spider mite
• spider monkey
• spider nevus
• spider orchid
• spider plant
• spider web
• spider's web
• spider-shaped
• spiderflower
• spiderlike
• spiderly
• spiderwort
• spiderwort family
• spidery
• spiegel
• spiegel iron
• spiegeleisen
• spiel
• spiel off
• Spielberg
• Spielmeyer-Vogt disease
• spiff
• spiff up
• spiffed up