- self-sufficiency
- selvage clay
- semi-colloid
- semi-crystal
- semi-finished
- semi-metal
- semi-solid
- semibasic rock
- semibituminous coal
- semibrittle fracture
- semicarbazide
- semichemical pulp
- semicrystalline
- semidestructive examination
- semidrying oil
- semimanufactured
- semipostive mold
- semiprecious stone
- semisilica brick
- semisolid
- semisoluble
- semisubmersiblerig
- sempatic
- sen
- sensitive market
- sensitized material
- separating agent
- separating column
- separating process
- separation
- separation effect
- separation process
- separation value
- separator
- separatory funnel
- Sequanian stage
- series production
- series welding
- serpentine
- serpentinous
- serpierite
- serpula reef
- serquester
- serquestering agent
- service corrosion
- service ship
- service test
- service valve
- set point
- set time
- setting time
- settled sewage
- settled volume
- settler
- settling pit
- settling sump
- settling tub
- settling vat
- sewage disposal
- sewage effluent
- sewer
- sextet
- shade paint
- shading
- shaft boring
- shaft caliper
- shaft gate
- shaft hoisting
- shaft key
- shaft lining
- shaft pump
- shaft sinking
- shale dome
- shale wax
- shaly lamination
- setting retarder
- settle
- settled production
- settled weather
- settlement area
- settling crack
- settling tank
- several liability
- severance
- severance tax
- severity factor
- sewage gas
- sewage purification
- sewage sludge
- shaft
- shaft cage
- shaft compartment
- shaft drive
- shaft frame
- shaft hoist
- shaft packing
- shaft pillar
- shaft set
- shaft timbering
- shaft wall