- secund
- securiform
- segmentation
- selection
- semiparasitic
- septa
- septate
- sericious
- sematic
- semi-parasitic
- septum
- serrate
- serrated
- sexdigitate
- sexual selection
- sheath
- sheathless
- shield
- simulant
- somatic
- sordid
- spatulate
- specialize
- spermatogenesis
- spermatozoa
- spermatozoon
- spatular
- spatuliform
- specialise
- specialization
- species
- specific
- sperm
- spermatogenetic
- spermine
- sphygmus
- spore
- sporogenesis
- sport
- squama
- squarrous
- spore-case
- sporogenous
- sporulate
- sporule
- stadium
- sporulation
- squamae
- station
- squarrose
- sterility
- stigma
- stipe
- stigmata
- stock
- stria
- striae
- subgenus
- subgroup
- suborder
- subuliform
- subvariety
- sulcated
- superorder
- stromata
- subkingdom
- subordinal
- substrata
- sudoriferous
- subspecific
- substratum
- subulate
- stroma
- stromatic
- subclass
- subfamily
- subform
- subspecies
- superparasitic
- superpcrasite
- sulcate
- superclass
- superfamily
- survival
- sutural
- suture
- swarm-cell
- swarm-spore
- sympathetic
- synapsis
- syngenesis
- systemic
- systolic
- symbiotic
- synapses
- systole
- tectology
- symbiosis
- testiculate
- throw-back