rhythm/o

rhytid/o

roentgen/o

rose/o

rot/o, rotat/o

rubr/o, rubr/i

sacchar/o

sacr/o

salping/o

sangu/i

sanit/a

sapr/o

sarc/o

scapul/o

schist/o

schiz/o

scint/i

scirrh/o

scler/o

scolec/o

scoli/o

scot/o

seb/o

sebace/o

sect/o

semin/i

seps/o

sept/o

ser/o

seven

sial/o

sialaden/o

sider/o

sigmoid/o

silic/o

sinistr/o

sinus/o

sit/o

six

skelet/o

somat/o

somn/o

son/o

span/o

spectr/o

sperm/o

spermat/o

sphen/o

spher/o

sphygm/o