Memory Game medical terminology word rootOnline version to know more about root words in skeletal system by mohamed said -lumb- -sacr- Relating to the lumbar region of the spine -petr- Relating to the petrous portion of the temporal bone Vertebral spine, vertebral column -crani- -rachi- Cranium Sacrum Sternum, breastbone -clavic- / -clavicul- Ribs -stern- Vertebra, spine, vertebral column -pelv/i- -spondyl- / - vertebr- Clavicle, collarbone -cost- Pelvis, pelvic bone