| half amplitude pulse duration | The time, in milliseconds, required for a wave form to reach half of its full magnitude. (05 Mar 2000) |
|---|---|
| half-axial projection | Reverse tilted AP radiographic projection devised to permit demonstration of the entire occipital bone, foramen magnum, and dorsum sellae, as well as the petrous ridges. Synonym: half axial view, half-axial projection, Towne view. (05 Mar 2000) |
| half axial view | Reverse tilted AP radiographic projection devised to permit demonstration of the entire occipital bone, foramen magnum, and dorsum sellae, as well as the petrous ridges. Synonym: half axial view, half-axial projection, Towne view. (05 Mar 2000) |
| half blood | 1. The relation between persons born of the same father or of the same mother, but not of both; as, a brother or sister of the half blood. See Blood, 2 and 4. 2. A person so related to another. 3. A person whose father and mother are of different races; a half-breed. In the 2d and 3d senses usually with a hyphen. Source: Websters Dictionary (01 Mar 1998) |
| half-blooded | 1. Proceeding from a male and female of different breeds or races; having only one parent of good stock; as, a half-blooded sheep. 2. Degenerate; mean. Source: Websters Dictionary (01 Mar 1998) |
| half-bred | 1. Half-blooded. 2. Imperfectly acquainted with the rules of good-breeding; not well trained. Source: Websters Dictionary (01 Mar 1998) |
| half-breed | A person who is blooded; the offspring of parents of different races, especially of the American Indian and the white race. See: Half-blooded. Source: Websters Dictionary (01 Mar 1998) |
| half-chair form | See: Haworth conformational formulas of cyclic sugars. (05 Mar 2000) |
| half-deck | 1. <zoology> A shell of the genus Crepidula; a boat shell. See Boat shell. 2. See Half deck, under Deck. Source: Websters Dictionary (01 Mar 1998) |
| half-fish | <zoology> A salmon in its fifth year of growth. Source: Websters Dictionary (01 Mar 1998) |
| half-glass spectacles | Spectacles, used for reading, in which the upper portion of the lenses are removed. Synonym: clerical spectacles, pantoscopic spectacles, pulpit spectacles. (05 Mar 2000) |
| half-hapten | A substance that elicits an antigen-antibody reaction, but no precipitation. (05 Mar 2000) |
| half-hearted | 1. Wanting in heart or spirit; ungenerous; unkind. 2. Lacking zeal or courage; lukewarm. (H. James) Source: Websters Dictionary (01 Mar 1998) |
| half-inferior | <plant biology> Of an ovary, partly below and partly above the level of attachment of the perianth and stamens. (13 Nov 1997) |
| half-life | 1. <pharmacology> The period over which the concentration of a specified chemical or drug takes to fall to half its original concentration in the specified fluid or blood. 2. <radiobiology> The time required to reduce the amount of a radionuclide to one-half the amount originally present. Physical or radioactive half-life refers to reduction of activity by radioactive decay, biological half-life refers to biological elimination from the body and effective half-life refers to the combined action of radioactive decay and biological elimination. (16 Dec 1997) |