stra - surf
- straddle
- straddle trench
- straight blowback
- straight face piston ring
- straight flight
- straight fluorine
- straight frame semi trailer
- straight grain
- straight groove barrel
- straight hole
- straight in landing minimum
- straight jet
- straight jet engine
- straight line course
- straight line distance
- straight line path generator
- straight mineral oil
- straight missed approach
- straight pull bolt
- straight pull rifle
- straight run petrol
- straight shooting weapon
- straight side slot
- straight taper case
- straight through flow chamber
- straight wall nozzle
- straight walled barrel
- straight wing
- straightener
- straightener blade
- straightening
- strain clamp
- strain gaging
- strain gauge
- strain gauge balance
- strain measurement sensor
- strainer
- strake fuel tank
- stralght and level command
- stramlined sail
