| Term | Definition |
| the science of the structures of living organisms | anatomy |
| the study of anesthesia | anesthesiology |
| without water | anhydrous |
| lack of appetitie | anorexia |
| pertaining to the lack of appetite | anorexic |
| one who studied life | biologist |
| the study of life | biology |
| one who studies the heart | cardiologist |
| one who studies the skin | dermatologist |
| the study of the skin | dermatology |
| the study of embryos | embryology |
| one who studies the endocrine system | endocrinologist |
| the study of the endocrine system | endocrinology |
| the study of the stomach and intestines | gastroenterology |
| a dentist who specializes in geriatric patients | geriodontist |
| study of old age | gerontology |
| the study of the female reproductive system | gynecology |
| the study of tissues | histology |
| the voice box | larynx |
| a place equiped to perform tests on patients | medical laboratory |
| one who studies the nervous system | neurologist |
| the study of the nervous system | neurology |
| one who operates on the nervous system | neurosurgeon |
| surgery of the nervous system | neurosurgery |
| one who cares for the sick and disabled | nurse |
| assists mothers with vaginal deliveries | nurse midwife |
| pertaining to pregnancy, labor and delivery | obstetrics |
| one who studies tumors | oncologist |
| study of tumors | oncology |
| one who studies the eye | ophthalmologist |
| the study of the eye | ophthalmology |
| one who fills ophthalmic prescriptions | optician |
| one who measures vision | optometrist |
| measurement of vision and adaptation of lenses | optometry |
| pertaining to the mouth | oral |
| the branch of medicine that deals with the musculoskeletal system | orthopedics |
| an orthopedic specialist | orthopedist |
| the study of the ear and throat | otolaryngology |
| the study of the ear | otology |
| the study of the ear, nose, and throat | otorhinolaryngology |
| disease producing microorganism | pathogen |
| pertaining to disease | pathologic |
| one who studies disease | pathologist |
| the study of disease | pathology |
| a doctor who specializes in children | pediatrician |
| pertaining to children | pediatrics |
| one who is licensed to prepare and dispense drugs | pharmacist |
| the study of drugs | pharmacology |
| treatment of disease with medications | pharmacotherapy |
| the throat | pharynx |
| one who treats patients using non-medicinal non-surgical means | physical therapist |
| the science of the function of living organisms | physiology |
| branch of surgery that deals with the repair of tissue | plastic surgery |
| one who studies the use of x-rays in the diagnosis and the treatment of disease | radiologist |
| the international unit of x-rays | roentgen |
| the study of x-rays | roentgenology |
| the branch of medicine that treats diseases, injuries, and deformities by manual or operative methods | surgery |
| pertaining to poison | toxic |
| the study of poison | toxicology |
| the study of the urinary tract | urology |