| CT unit | A unit of X-ray attenuation in each picture element of the CT image. See: Hounsfield unit. (05 Mar 2000) |
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| haemolytic unit | The smallest quantity (highest dilution) of inactivated immune serum (haemolysin) that will sensitise the standard suspension of erythrocytes so that the standard complement will cause complete haemolysis. Synonym: amboceptor unit. (05 Mar 2000) |
| Haldane's evolutionary unit | <unit> A unit of measurement, given in darwins, which measures the increase in body size of a chronospecies over evolutionary time. (13 Nov 1997) |
| progesterone unit | The progestational activity of 1 mg of unit of progestational activity; standard preparation of pure progesterone. See: Clauberg test, Corner-Allen unit. Synonym: corpus luteum hormone unit, unit of luteinizing activity. (05 Mar 2000) |
| prolactin unit | The specific lactogenic activity contained in 0.1 mg of the standard preparation of the lactogenic substance of the anterior pituitary gland. (05 Mar 2000) |
| heparin unit | The quantity of heparin required to keep 1 ml of cat's blood fluid for 24 hr at 0캜; it is equivalent approximately to 0.002 mg of pure heparin. Synonym: Howell unit. (05 Mar 2000) |
| Schwann cell unit | A single Schwann cell and all of the axons lying in troughs indenting its surface; this unit regarded as an unmyelinated fibre in the peripheral nervous system. (05 Mar 2000) |
| high energy particle generating unit | A machine capable of providing highly energised radiation for the purposes of radiotherapy treatment. (16 Dec 1997) |
| Holzknecht unit | An obsolete unit of X-ray dosage equal to one-fifth of the erythema dose. (05 Mar 2000) |
| Hounsfield unit | A normalised index of X-ray attenuation based on a scale of -1000 (air) to +1000 (bone), with water being 0; used in CT imaging. (05 Mar 2000) |
| Howell unit | The quantity of heparin required to keep 1 ml of cat's blood fluid for 24 hr at 0캜; it is equivalent approximately to 0.002 mg of pure heparin. Synonym: Howell unit. (05 Mar 2000) |
| Sherman-Bourquin unit of vitamin B2 | The amount of vitamin B2 required in the diet daily to sustain an average weekly gain of 3 g for 8 weeks in standard test rats; one unit is equivalent to 1 to 7 ug (0.001 to 0.007 mg) of riboflavin, depending on the deficiency diet used in the above assay. (05 Mar 2000) |
| Sherman-Munsell unit | A rat growth unit; the daily amount of vitamin A which sustains a rate of gain amounting to 3 g a week in standard test rats. (05 Mar 2000) |
| Sherman unit | Unit of vitamin C, minimum protective dose; the minimum amount of vitamin C which, fed daily, will protect a 300-g guinea pig from scurvy for 90 days; equivalent to 0.5 to 0.6 mg of ascorbic acid. (05 Mar 2000) |
| SI unit | <chemistry, physics> An International System of Units of measurement in which the fundamental units are standardised. Examples include: metre, kilometre, ampere, gray, joule, Sievert, Becquerel. Origin: Fr. Le Systeme International d'Unites (18 Nov 1997) |