| ED | early-decision [applicant]; early differentiation; ectodermal dysplasia; ectopic depolarization; eff... |
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| ESD | electronic summation device; electrostatic discharge; emission spectrometric device; end-systolic di... |
| HDI | hemorrhagic disease of infants; hexamethylene diisocyanate; hospital discharge index |
| HDS | Hamilton Depression Scale; Health Data Services; health delivery system; Healthcare Data Systems; he... |
| NHDS | National Health Data System; National Hospital Discharge Survey |
| USP unit | A unit as defined and adopted by the United States Pharmacopeia. (05 Mar 2000) |
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| Fishman-Lerner unit | A unit of serum acid phosphatase activity based upon measurement of the amount of phenol released from a phenylphosphate substrate. (05 Mar 2000) |
| Florey unit | <microbiology> The minimum amount of penicillin which will prevent the growth of Staphylococcus aureus over an area 26 mm in diameter in a standard culture medium; 1 unit equals 0.6 ug of crystalline sodium salt of penicillin. Synonym: Florey unit. (05 Mar 2000) |
| focus-forming unit | A measurement of the concentration of live virus in a given amount of fluid. This is measured by spreading a known amount of the fluid over a layer of cultured cells which are infected by the virus, then counting the number of areas in the culture which look infected. (09 Oct 1997) |
| laminar air flow unit | An air-filtering system used at some transplant facilities to remove particulate matter and fungi from the air. (16 Dec 1997) |
| lung unit | A respiratory bronchiole together with the alveolar ducts and sacs and pulmonary alveoli into which the respiratory bronchiole leads, considered by some to include the terminal bronchiole and its subdivisions, and called a pulmonary acinus. (05 Mar 2000) |