1. A semi-transparent graphical and textual display of information projected upon the field of view of a pilot of an aircraft
   - head-up display

Encyclopedia: Heads-up display

• sliding door
• sliding keel
• sliding scale
• sliding seat
• sliding window
• slight
• slight care
• slighting
• slightingly
• slightly
• slightness
• slim
• slim chance
• slim down
• slim-bodied
• slim-waisted
• slime
• slime bacteria
• slime eels
• slime mold
• slime mould
• slime mushroom
• slimebag
• Emberiza citrinella
• Emberiza hortulana