spac - star
- space correction
- space geology
- space group
- space groupoid
- space lattice
- space remote sensing
- space survey
- space velocity
- spacegeology
- spacing
- spadaite
- spallation product
- spallation reaction
- spalling
- spandite
- spangolite
- spar
- sparagmite
- spare
- spate
- spatter
- speciation
- species
- specific capacity
- specific charge
- specific density
- specific discharge
- specific drawdown
- specific electrical conductance
- specific gravity
- specific heat
- specific ionization
- specific reaction
- specific retention
- specific surface
- specific volume
- specific yield
- specimen
- spectral line
- spectral line width
