- shrinkage joint
- shunting tractor
- shut-down
- shuttle helicopter
- siccative
- side dryer
- side group
- side lacing
- side stoping
- side thrust
- sidestream stripper
- sieve cloth
- single test
- sink
- sink hole
- sinker
- sinking bucket
- Sinking fund
- sinking hammer
- sideband alloy
- siderophyllic element
- sidetrack drilling
- sienna
- sieve drier
- sieve drum
- sieve frame
- sieve residue
- sieve set
- sieve shaker
- sieve test
- sifted coal
- sight assets
- sight gauge
- signalling bomb
- significance
- silica additive
- silica gel
- silica glass
- silica pebble
- silicate modulus
- silication
- siliceous additive
- siliceous earth
- siliceous residue
- silicfication
- silicic acid
- silicified
- silicon bronze
- silicon micromachining
- silicon photodiode
- silicone
- silicone elastomer
- silicosis
- silk cotton
- silky lustre
- silphenylene
- silver leaf
- silver-plate
- simarouba
- sinter deposit
- sintered
- sintered carbide
- sintering technique
- siphon
- siphon lubricator
- siphon oiler
- siphon pot
- siporex
- sisal
- site
- site development
- sixteen
- size enlargement
- size oil
- size separation
- sized
- sized coal
- sized paper
- sizing
- sizing agent
- skapolith
- skeletal limestone
- skeleton crystal
- skeleton structure
- skeleton texture
- skerry
- slabber
- slack loop
- slag bottom
- slant drilling
- slat
- slaty marl
- sleeve joint
- sliding damper
- slim hole
- slimy
- sling chain
- sling hydrometer
- slip marking
- slippage phenomena