China
Africa
- Spectral sensitivity
- Spectral slope
- Spectral theorem
- Spectral theory
- Spectral width
- Spectralon
- Spectre
- Spectre circuit simulator
- Spectrin
- Spectrochemical series
- Spectroelectrochemistry
- Spectrograms
- Spectrograph
- Spectrophotometers
- Spectrophotometry
- Spectroradiometers
- Spectroscopic notation
- Spectroscopy
- Spectrum
- Spectrum analyzer
- Spectrum bias
- Spectrum disorder
- Spectrum management
- Spectrum of a matrix
- Spectrum of a ring
- Specular reflection
- Specularity
- Speech disorders
- Speech enhancement
- Speech processing
- Speech production
- Speech recognition
- Speech synthesis
- Speech technology
- Speech transmission index
- Speech-generating device
- Speed
- Speed cameras
- Speed of light
- Speed of sound
- Speed record
- Speedstep
- Speedup
- Speex
- Speleothems
- Spell checker
- Spent caustic
- Spent fuel pool
- Spent grain
- Spent nuclear fuel
- Spent shale
- Sperm
- Sperm sorting
- Spermaceti
- Spermatheca
- Spermatids
- Spermatocyte
- Spermatogenesis
- Spermatogonial stem cells
- Spermatozoa
- Spermidine
- Spermidine synthase
- Spermiogenesis
- Spessartine
- Sphaerotilus natans
- Sphalerite
- Sphere
- Sphere of influence
- Sphere packing
- Spheres
- Spherical bearing
- Spherical caps
- Spherical coordinate system
- Spherical geometry
- Spherical harmonics
- Spherical image
- Spherical pendulum
- Spherical roller bearing
- Spherical sector
- Spherical segment
- Spherical shell
- Spherical symmetry
- Spherical tokamak
- Spherical trigonometry
- Sphericity
- Spherocytosis
- Spheroids
- Spherometer
- Spheroplasts
- Spherulites
- Sphincter
- Sphincter of Oddi
- Sphingolipids
- Sphingomonas
- Sphingomonas elodea
- Sphingomyelin
- Sphingomyelinase
- Sphingosine
- Sphingosine-1-phosphate receptor
- Sphygmomanometer
- Spider silk
- Spidroin
- Spiegeleisen
- Spike protein
- Spiking neural networks
- Spill containment
- Spillage
- Spillover
- Spillover infection
- Spillways
- Spin
- Spin angular momentum of light
- Spin casting
- Spin chemistry
- Spin coating
- Spin connection
- Spin contamination
- Spin crossover
- Spin density waves
- Spin diffusion
- Spin echo
- Spin glasses
- Spin hall effect
- Spin ice
- Spin label
- Spin magnetic moment
- Spin model checker
- Spin polarization
- Spin probe
- Spin quantum number
- Spin representation
- Spin states
- Spin structure
- Spin transistor
- Spin trapping
- Spin valves
- Spin waves
- Spin-exchange interaction
- Spin-forbidden reactions
- Spin-lattice relaxation
- Spin-orbit interaction
- Spin-spin coupling
- Spin-spin relaxation
- Spin-transfer torque
- Spina bifida
- Spinal anaesthesia
- Spinal anesthesia
- Spinal canal
- Spinal cord
- Spinal cord compression