| Term | Definition | Pronunciation |
| F | Fahrenheit | |
| faci/o | face | |
| -facient | to cause | |
| factitious disorder | Conditions in which a person deliberately and consciously acts as if he or she has a physical or mental illness when he or she is not really sick. Known as Munchausen Syndrome. | fak-tish´us |
| fallopian tubes | A pair of highly specialized muscular canals that conduct the ovum from the ovary to the uterus. | |
| fasci/o | fascia (layer of fibrous tissue) | |
| fascia | Layers of connective tissue enveloping, separating, or binding together muscles, organs, and other soft structures of the body. | |
| fasciitis | Inflammation of the fascia, which is the connective tissue surrounding muscles, blood vessels and nerves. | fas″e-i´tis |
| fastigium | The period of greatest intensity | |
| fat | A substance that stores energy in the body and serves as an insulating material. One of the three primary constituents of food. | |
| fatigue | Tiredness following mental or physical exertion. | |
| FBS | fasting blood sugar | |
| FDA | (U.S.) Food and Drug Administration | |
| Fe | iron | |
| febr/i | fever | |
| febricula | Mild or short-lived. | |
| feces | Excrement from the intestines, containing unabsorbed solids, waste products, secretions, and bacteria. | |
| FEF | forced expiratory flow | |
| feline | Belonging or pertaining to the cat family | |
| femininity | Female-associated sex-specific social roles and behaviors unrelated to biologic function. | |
| femor/o | femoral (thigh bone) | |
| femoral | Pertaining to the thigh or femur. | |
| femur | The longest and largest bone of the skeleton, it is situated between the hip and the knee. | |
| fenestra | A small opening or transparent spot. | |
| ferr- | iron | |
| fertilization | The fusion of a spermatozoon with an ovum thus resulting in the formation of a zygote. | |
| fet/o | fetus | |
| fetal | Of, pertaining to, or having the character of a fetus. | |
| fetus | The embryo of a mammal in the later stages of development | |
| FEV | forced expiratory volume | |
| fever | An abnormal elevation of body temperature, usually as a result of a pathologic process. | |
| FFP | fresh frozen plasma | |
| FHR | fetal heart rate | |
| FHT | family history | |
| fibr/o | fiber | |
| fibrillation | A rapid twitching of muscle fibers, particularly of the heart, caused by the abnormal electrical impulses. | |
| fibrin | An insoluble protein end product of blood coagulation, formed from fibrinogen by the action of thrombin. | |
| fibrinogen | A blood plasma protein produced by the liver. It is one of many coagulation factors responsible for normal blood clotting. | fi-brin´o-jen |
| fibroadenoma | Benign tumors composed of stromal and epithelial tissue. | fi″bro-ad″ĕ-no´mah |
| fibrocystic breast disease | A painful, lumpy breast disease. | fi″bro-sis´tik |
| fibroid | A benign tumor containing fibrous tissue, particularly in the uterus. | |
| fibroma | A benign tumor consisting of fibrous tissue. | |
| fibromyalgia | A common, chronic disorder characterized by widespread pain, diffuse tenderness, chronic fatigue, and other symptoms. | fī'brō-mī-al'jē-ă |
| fibrosarcoma | A form of malignant tumor derived from fibrous connective tissue | |
| fibrosis | Any pathological condition where fibrous connective tissue invades any organ, usually as a consequence of inflammation or other injury. | |
| fil/o | thread | |
| FISH | fluorescence in situ hybridization | |
| fiss- | split | |
| fissure | A slit, cleft or deep furrow; a small tear. | fish´er |
| fistula | An abnormal connection between two body parts. | fis´tu-lah |
| fl oz | fluid ounce | |
| flatulence | Production of gas in the gastrointestinal tract which may be expelled through the anus. | |
| flav/o | yellow | |
| Fld | fluid | |
| flex/o | bend | |
| flexion | The act of bending a limb or the position that a limb assumes after it is bent. | |
| flexor | Any muscle that causes a limb to bend. | |
| floater | A speck or string that appears to be drifting across the eye just outside the line of vision. | |
| fluctuation | A wavelike motion. A variation. | |
| fluor/o | fluorine, fluoride | |
| fluorescein angiography | An eye test that uses a special dye and camera to look at blood flow in the retina and choroid. | floo͡-res´ēn |
| fluorescence | The property of emitting radiation while being irradiated. | |
| fluoridation | Practice of adding fluoride to water for the purpose of preventing tooth decay and cavities. | |
| flush | A transient reddening of the face. A blush. | |
| focus | The point at which rays of line converge after passing through a lens. | |
| follicle | A small secreting gland, sac or cavity. | |
| follicle-stimulating hormone | A hormone released by the pituitary gland. It regulates the development, maturation and reproductive processes of the body. | |
| follicul/o | follicle (small cavity) | |
| folliculitis | An infection in the hair follicles. | fŏ-lik″u-li´tis |
| foot | The distal extremity of the leg, consisting of the tarsus, metatarsus, phalanges and the soft tissues surrounding the bones. | |
| forceps | An instrument for compressing or grasping tissues. | |
| fore- | before, in front | |
| forearm | Part of the arm in humans extending from the elbow to the wrist. | |
| forehead | The part of the face above the eyes. | |
| -form | form, shape of | |
| formication | A strange sensation of ants crawling on the skin. | |
| formulary | A list of pharmaceutical substances along with their formulas, uses, and methods of preparation. Also, an official list of drugs approved for prescription or administration to patients of a hospital or health maintenance organization | |
| fourier analysis | Use of the Fourier transform, a mathematical technique for describing fluctuating patterns in the physical world in terms of frequencies. | |
| FP | family practice | |
| fract- | break | |
| fractals | Patterns (real or mathematical) which look similar at different scales. | |
| freeze drying | Method of preparing a tissue specimen by freezing and then dehydrating in a high vacuum. | |
| frig/o | cold | |
| FROM | full range of motion | |
| frontal bone | The bone that forms the frontal aspect of the skull. | |
| frontal coronal plane | Separates the body's anterior and posterior | |
| frontal lobe | The part of the cerebral hemisphere anterior to the central sulcus, and anterior and superior to the lateral sulcus. | |
| FSH | follicle-stimulating hormone | |
| FTND | full term normal delivery | |
| FTT | failure to thrive | |
| funct/o | performance | |
| fundus | The base of an organ. | |
| fungicide | An agent that kills or inhibits the growth of fungi. | |
| FUO | fever of unknown origin | |
| furuncles | A boil, which are bacterial or fungal infections of hair follicles. | fŭr-ŭng'kĕlz |
| fusion | The merging of adjacent parts. | |
| FVC | forced vital capacity | |
| Fx | fracture | |