smokescope - spectrum selector
- spatial density
- spatial dispersion
- spatial grid
- spatial harmonic
- spatial mode
- spatial model
- spatial orientation
- spatter
- spattle
- spatula
- spawn
- spawning
- speak
- speaker
- speaking key
- speaking trumpet
- spear
- spear plate
- spearing
- special shape
- special-purpose container
- specialit
- specially developed
- species
- specific
- specific capacity
- specific capacity of boiler
- specific coding
- specific conductivity
- specific consumption
- specific density
- specific duty
- specific elongation
- specific energy
- specific gravity
- specific heat
- specific humidity
- specific impulse
- specific inductive capacity
- specific ionization
