| TERM | MEANING |
| sacchar/o | sugar |
| sacr/o | sacrum |
| salping/o | fallopian tube |
| sangu/i, sanguin/o | blood |
| sanit/a | health |
| sap/o | soap |
| sapr/o | rotten, decay |
| sarc/o | flesh |
| scaph/o | boat-shaped |
| scapul/o | scapula |
| scat/o | feces |
| scel/o, -scelia | leg |
| schist/o, -schisis | split, cleft |
| schiz/o | split, division |
| scint/i | spark |
| scirrh/o | hard |
| scler/o | sclera |
| -sclerosis | hardening |
| scolec/o | worm |
| scoli/o | crooked, twisted |
| -scope | instrument for visual examination |
| -scopy | visual examination |
| scot/o | darkness |
| scrib/o, script/o | to write |
| seb/o | sebum |
| -sect | to cut |
| secund/i | second |
| sedat/o | to calm |
| semi- | half |
| semin/i | semen |
| senil/o | old, old age |
| sensor/i | sensory |
| sens/o, sensat/o | feeling, perception |
| -sepsis, septic/o | putrefaction, putrifying |
| sept/o | partition |
| sept-, septi- | seven |
| ser/o | serum, serous |
| sesqui- | one and a half |
| sex- | six |
| sial/o | saliva |
| sicc/o | to dry |
| sider/o | iron |
| sigmoid/o | sigmoid colon |
| silic/o | silica, quartz |
| sinistr/o | left |
| sinus/o, sin/o | cavity, sinus |
| sit/o | food |
| skelet/o | skeleton |
| soci/o | social, society |
| sodi/o | compound containing sodium |
| solut/o | dissolved |
| somat/o | body |
| -some | body |
| somn/i, -somnia | sleep |
| son/o | sound |
| span/o | scanty, scarce |
| -spasm, spasm/o | involuntary contraction |
| spectr/o | image, spectrum |
| sperm/o, spermat/o | spermatozoa |
| sphen/o | wedge, sphenoid bone |
| spher/o | round, sphere |
| sphygm/o | pulse |
| -sphyxia | pulse |
| spin/o | spinal cord, spine |
| spir/o | breathe |
| splanchn/o | viscera |
| splen/o | spleen |
| spondyl/o | vertebrae, spinal column |
| spongi/o | spongelike, spongy |
| spor/o | spore, seed |
| squam/o | squamous, scales |
| -stabile | stable, fixed |
| stahyl/o | uvula, grape like clusters |
| -stalsis | contraction |
| staped/o | stapes |
| -stasis | standing still, standing |
| -stat | device/instrument for keeping something stationary |
| steat/o | fat |
| -stenosis, sten/o | narrowed, constricted |
| stere/o | solid, three dimensional |
| steril/o | barren |
| stern/o | sternum |
| steth/o | chest |
| sthen/o, -sthenia | strength |
| stich/o, -stichia | rows |
| stigmat/o | mark, point |
| stomat/o | mouth |
| -stomy | surgical opening |
| strat/i | layer |
| strept/o | twisted, curved |
| strict/o | to tighten, bind |
| -stroma | supporting tissue of an organ |
| stroph/o | twisted |
| sub- | under, beneath |
| succ/o | juice |
| suct/o | to suck |
| sud/o | sweat |
| sulc/o | furrow, groove |
| super- | above, beyond |
| supra- | above, beyond |
| suspend/o, suspens/o | to hang up, suspend |
| symptom/o | occurrence |
| sym-, syn- | with, together |
| synaps/o, synapt/o | point of contact, to join |
| syndesm/o | ligament, connective tissue |
| synov/o | synovia, synovial membrane |
| syphil/o | syphilis |
| syring/o | tube, fistula |
| system/o | system |
| systol/o | contraction |
