- splayfoot
- self_denial
- setting point
- short run
- single dose
- single phase motor
- single length working
- soft capsule
- south pacific
- shooting preserve
- scheuermanns disease
- subpial astrocyte
- sunken_eyed
- super conducting memory
- super fatted soap
- second language
- scotland
- subcultivation
- subcultured
- sensor_based computer
- sensorimotor
- second trimester
- skin_dive
- second home
- saxicolous
- saxicoline
- scot free
- sea level
- soupiness
- sea squirt
- spin_relaxation time
- spinnbar
- spinnable
- spina bifida occulta
- self_discipline
- split_half correlation
- side to side anastomosis
- speech input
- saxo grammaticus
- solochrome black
- solitariness
- silvery_leaved
- silencer
- syphon
- syphiltic endocarditis
- silver or grain etc. equivalent to the weight of the donor
- sleep terror disorder
- sleep tight
- subsidiary
- subsidiary cell