1. Free from admixture with noxious elements; clean
   "unpolluted streams"
   - uncontaminated

See also: pure

• stopgap
• stoplight
• stopover
• stoppable
• stoppage
• stoppage time
• Stoppard
• stopped
• stopped-up
• stopper
• stopper knot
• stoppered
• stopping
• stopping point
• stopple
• stops
• stopwatch
• storage
• storage allocation
• storage area
• storage battery
• storage cell
• storage device
• storage locker
• storage medium