Directions: Define the combining form or suffix in the spaces provided. 1. concuss/o 2. cerebell/o cerebellum 3. cerebr/o cerebrum 4. encephal/o brain 5. gli/o glue. 6. mening/o menininges. 7. myel/o spinal cord. 8. neur/o nerve. 9. astr/o star. 10. poli/o gray matter 11. pont/o pons. 12. radicul/o 13. thalam/o 14. ventricul/o ventricle 15. medull/o medulla 16. esthesi/o feeling, sensation. 17. -paresis paralysis. 17. -paresis paralysis 18. -taxia arrangement, order. 19. compuls/o 20. depress/o 21. narc/o 22. ped/o child, foot. 23. pxr / o 24. -lepsy 25. -mania.