| FWHM | full width at half maximum |
|---|---|
| H1/2 | half-value layer |
| HE | half-scan with extrapolation; hard exudate; hektoen enteric [agar]; hemagglutinating encephalomyelit... |
| hf | half; high frequency |
| HI | half-scan with interpolation; head injury; health insurance; hearing impaired; heart infusion; hemag... |
| fixed-rate pacemaker | An artificial pacemaker that emits electrical stimuli at a constant frequency. (05 Mar 2000) |
|---|---|
| fixed rate pulse generator | A generator in which the rate of discharge is independent of the natural activity of the heart. Synonym: fixed rate pulse generator. (05 Mar 2000) |
| flow rate | The amount of water that moves through an area (usually pipe) in a given period of time. (05 Dec 1998) |
| foetal death rate | The number of foetal deaths divided by the sum of live births and foetal deaths occurring in the same population during the same time period. Synonym: stillbirth rate. (05 Mar 2000) |
| foetal heart rate | In the foetus, the number of heart beats per minute, normally 120 to 160. (05 Mar 2000) |
| foetal mortality rate | <epidemiology> The ratio of foetal deaths divided by the sum of the births (the live births + the foetal deaths) in that year. In the United States, the foetal mortality rate plummeted from 19.2 per 1,000 births in 1950 to 9.2 per 1,000 births in 1980. (12 Dec 1998) |
| 5-year relative survival rate | <statistics> The likelihood that a patient will not die from causes associated with his or her cancer for at least 5 years after diagnosis. This is the standard many professionals use when determining someone a survivor of cancer. (16 Dec 1997) |
| lethality rate | <statistics> The proportion of deaths in a population or to a specific number of the population. (18 Nov 1997) |
| lowest achievable emissions rate | (LAER) Used to describe air emissions control technology. A rate of emissions defined by the permitting agency. LEAR sets emission limits for non-attainment areas. (05 Dec 1998) |