- screening inspection
- screw
- screw axis
- screw calculus
- screw displacement
- screwing
- screw line
- screw moment
- screw motion
- screw operation
- screw theorem
- scriber
- scroll
- scruple
- s-cycle
- Scylax (of Caryanda)
- SDE (= stochastic differential equation)
- S-distribution
- S-duality
- sea horse valley
- search
- search algorithm
- search direction
- search for a moving target
- searching