PREFIXES A. Latin and Greek origin B. Anatomy of a Medical Term 1. Dissect the word and it is less threatening. a. Prefix…..at the beginning b. Root……gives the essential meaning of the word c. Combining vowel…..single vowel, usually an “0” at the end of the root, which makes the word easier to pronounce. d. Combining form…..root + combining vowel e. Suffix…..at the end of a word C. Prefixes…..added to the beginning to modify the meaning. 1. Contrasting Prefixes a. A….without or no……..ex: atraumatic b. An...without or no……..ex: anuria c. Ab…away from……….ex: abduction Ad…toward…………...ex: adduction d. Dys…difficult or bad…ex: dysphagia Eu….good or normal… ex: euthyroid e. Endo..within or inside…ex: endocrine Exo…without, outside of…ex: exocrine Ecto…outside of………ex: ectoparasite f. Hyper….higher, increased…ex: hyperthyroid Hypo…..lower, decreased….ex: hypothyroid g. Inter….between….ex: interdigital Intra….within……ex: intradigital h. Poly….many, excessive….ex: polyuria Oligo…little or scant……. ex: oliguria i. Pre…before…….ex: preanesthetic Post..after………ex: postanesthetic j. Sub…below, under….ex: sublingual Super or supra…above…ex: suprascapular D. Directional Prefixes 1. epi…..upper………ex: epidermis 2. extra,,,outside…….ex: extracurricular 3. infra…below, beneath….ex: infraorbital 4. meta…beyond……ex: metaphysical 5. per….throughout…ex: percutaneous 6. trans…across……..ex: transabdominal 7. ultra…increase more than normal….ultraviolet E. Other Prefixes or word roots 1. arthro…….joint 2. gastro…….stomach 3. pan……….without 4. osteo……..bone 5. hema……..blood 6. hepa……...liver 7. nephro……kidney 8. cardio…….heart 9. neuro…….nerve 10. oto……….ear 11. optho…….eye 12. myo……...muscle 13. thoraco…..ribs 14. entero……intestine 15. myelo……nerve, spinal cord 16. derm……..skin 17. pneumo….lungs or air 18. cephalo…..brain 19. cysto……..bladder 20. podo……..foot 21. pyo………pus 22. rhino…….nose