- secondary vein
- section
- sediment
- sedimentary deposit
- sedimentary discontinuity
- sedimentary gap
- sedimentary petrography
- sedimentation balance
- sedimentation constant
- sedimentation glass
- sedimentation potential
- sedimentation tank
- seebachite
- seep
- Segas process
- segregated vein
- seismic cable
- seismic dispersion
- seismic filter
- seismic path
- seismic prospection
- seismogel
- selective adsorbent
- selective cracking
- selective fusion
- selecto
- selenious
- selenitic
- self bonding
- self-fluxing
- self-hardening
- self-ignition
- seligmannite
- semi-coke
- semi-permeability
- semiclastic rock
- semidine
- semiplastic explosive
- semipressure pipe
- semiskilled worker
- semitransparent
- semseyite
- senarmontite
- seismic instrument
- seismic ray
- seismic reflection
- selective corrosion
- selective entrainer
- selective extraction
- selective flotation
- selective wetting
- selenic
- self-igniting
- self-lubricating
- self-vulcanization
- semi-prime
- semicarbazone
- semichemical pulping
- semiconductor oxide
- semifloating
- semipostive mould
- semiprocessed steel
- semipure
- sendust
- Senecanian stage
- Senonian stage
- sensitive emulsion
- sensitizer
- separate
- separate out
- separating burette
- separating power
- separation factor
- separation liquid
- separatory drum
- sepetir
- sepia
- septivalent
- sequestering agent
- sequestration
- serac
- serandite
- serendibite
- serial section
- sericite
- sericitic
- sericitization
- series compounds
- series connection
- seismic exploration
- seismic prospecting
- seismographic record
- seizure
- selective fermentation
- selective rule
- selective treatment
- selenide
- self-excitation
- self-heating
- self-locking