- standard clock
- standard condition
- standard cycle
- Standard deviation
- standard frequency
- standard inductor
- standard lamp
- standard microphone
- standard pressure
- standard ratings
- standard refraction
- standard resistor
- standard shim
- standard solenoid
- standard spacer
- standard spectrum
- standard state
- standard time
- standardless analysis
- standby
- standby compressor
- standby cooler
- standby cooling
- standby loss
- standby tariff
- standing wave
- standoff insulator
- staniferous
- stannum
- Stanton number
- star
- star atlas
- star clusters
- star lamp
- star point
- spoiler
- sponginess
- spot cooling
- spotlight
- spray chamber
- spray condenser
- spray cooler
- spray deck
- spray defrosting
- spray freezing
- spray header
- spray pond
- spray pump
- spray thawing
- spray zone
- sprayed insulant
- sprayed solution
- spring scales
- SPST
- spume
- spur
- spurious modulator
- sputtering
- square brackets
- square diffuser
- square fin
- square wave
- star voltage
- Stark broadening
- Stark effect
- Stark number
- starting box
- starting current
- starting reactor
- starved evaporator
- statA
- statampere
- statC
- statcoulomb
- statfarad
- statH
- stathenry
- static balancer
- static characteristic
- static discharger
- static efficiency
- static electricity
- static head
- static inverter
- static magnetism
- static permittivity
- static regulator
- static suppression
- static switching
- static universe
- static ventilation
- Stationarity
- stationary
- stationary constraint
- Stationary state
- stationary universe
- stationary ventilator
- statistic straggling
- statistic test
- statistical average