- stratigraphic unit
- straw
- straw boss
- straw distillate
- straw oil
- stray block
- stray current
- stray sand
- streakiness
- stream bed
- stream day
- stream gold
- stream gravity
- stream placer
- stream pollution
- stream terrace
- stream tin
- streaming potential
- streamlet
- streamlined
- streamlining
- strength test
- strengthen
- stress corrosion
- stress crack
- stress limit
- stress relaxation
- stress relieving
- stress rupture
- stress shrinking
- stretched
- stretcher pulley
- striated
- striated boulder
- striated pebble
- striation
- strike
- strike bath
- strike deposit
- strike joint
- strike oil
- strike overlap
- strike slip
- strike stream
- string
- stripper production
- stripping
- stroke
- stromatology
- strong acid
- strong rubber
- structural closure
- structural elevation
- structural platform
- structural stability
- structural strap
- structural trap
- structural valley
- stuck piston
- stuff
- stull timbering
- stylolitic structure
- styrene
- sub lattice
- subalkaline
- subatomic
- subdivision
- subjacent bed
- sublimating vessel
- sublimation temperature
- submerged reef
- submountain region
- subnitrate
- subsea drilling
- subsequent valley
- subsilicic rock
- subsurface structure
- subvitreous
- sucker rod
- suction gas
- suction height
- suction limit
- suet oil
- sugary grain
- sulfamate
- sulfanilic
- sulfinyl
- sulfoid
- sulfonamide
- sulfonic acid
- sulfur fuel
- sulfur oxide
- sulfurous combustible
- sulpha drug
- sulphaguanidine
- sulphanilamide
- sulpharsenide
- sulphated
- sulphide ore
- sulphidize