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| HL | Half Life |
|---|---|
| HVL | Half-Value Layer |
| ss | semis; one half; ¹Ý |
| Tb | biologic Half-Life |
| Te | effective Half-Life |
| CCTR | Cochrane Controlled Trial Register |
|---|---|
| NHS-CR | National Health Service Central Register |
| HVL | 6-half-value layer |
| FWHM | Full width at half maximum |
| HASTE | Half-Fourier Acquisition Single-Shot Turbo Spin Echo |
one and one-half syndrome
| half register | <molecular biology> A misalignment between two identical sets of repeating units of nucleotides within two copies of the same chromosome (one set of repeating units per copy of the chromosome), where repeating unit A from one set is inappropriately aligned with repeating unit B on the other set, so that ABABAB on one set would be aligned with BABABA on the other set instead of the correct ABABAB with ABABAB. (13 Nov 1997) |
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| half and half nail | Division of the nail by a transverse line into a proximal dull white part and a distal pink or brown part; seen in uraemia. (05 Mar 2000) |
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| register | 1. A written account or entry; an official or formal enumeration, description, or record; a memorial record; a list or roll; a schedule. "As you have one eye upon my follies, . . . Turn another into the register of your own." (Shak) 2. A record containing a list and description of the merchant vessels belonging to a port or customs district. A certificate issued by the collector of customs of a port or district to the owner of a vessel, containing the description of a vessel, its name, ownership, and other material facts. It is kept on board the vessel, to be used as an evidence of nationality or as a muniment of title. 3. [Cf. LL. Registrarius. Cf. Regisrar] One who registers or records; a registrar; a recorder; especially, a public officer charged with the duty of recording certain transactions or events; as, a register of deeds. 4. That which registers or records. Specifically: The part of a telegraphic apparatus which records automatically the message received. A machine for registering automatically the number of persons passing through a gateway, fares taken, etc.; a telltale. 5. A lid, stopper, or sliding plate, in a furnace, stove, etc, for regulating the admission of air to the fuel; also, an arrangement containing dampers or shutters, as in the floor or wall of a room or passage, or in a chimney, for admitting or excluding heated air, or for regulating ventilation. 6. The inner part of the mold in which types are cast. The correspondence of pages, columns, or lines on the opposite or reverse sides of the sheet. The correspondence or adjustment of the several impressions in a design which is printed in parts, as in chromolithographic printing, or in the manufacture of paper hangings. See Register. 7. The compass of a voice or instrument; a specified portion of the compass of a voice, or a series of vocal tones of a given compass; as, the upper, middle, or lower register; the soprano register; the tenor register. In respect to the vocal tones, the thick register properly extends below from the F on the lower space of the treble staff. The thin register extends an octave above this. The small register is above the thin. The voice in the thick register is called the chest voice; in the thin, the head voice. Falsetto is a kind off voice, of a thin, shrull quality, made by using the mechanism of the upper thin register for tones below the proper limit on the scale. A stop or set of pipes in an organ. Parish register, A book in which are recorded the births, baptisms, marriages, deaths, and burials in a parish. Synonym: List, catalogue, roll, record, archives, chronicle, annals. See List. Origin: OE. Registre, F. Registre, LL. Registrum,regestum, L. Regesta, pl, fr. Regerere, regestum, to carry back, to register; pref. Re- re- + gerere to carry. See Jest, and cf. Regest. Source: Websters Dictionary (01 Mar 1998) |
| biological half-life | <biochemistry, biology> This is the time required for one-half of the total amount of a particular substance in a biological system to be consumed or broken down by biological processes when the rate of removal is approximately exponential. Toxic chemicals with a long biological half-life (such as some pesticides) will tend to accumulate in the body and are, therefore, more likely to be harmful. A substance with a short biological half-life may still accumulate if a portion of it it becomes tightly bound to bone or other tissues, even if most of it is quickly cleared from the body. (21 Mar 1998) |
| red half-moon | <clinical sign> Irregular red discoloration of the usually pale demilune at the base of the fingernail; may be seen in congestive failure, malignant disease, or liver disease, but not specific for any of these. (05 Mar 2000) |
| physical half-life | The time required for half the atoms of a radionuclide to undergo disintegration. (05 Mar 2000) |
| half | In an equal part or degree; in some pa appromating a half; partially; imperfectly; as, half-coloured, half done, half-hearted, half persuaded, half conscious. "Half loth and half consenting." "Their children spoke halfin the speech of Ashdod." (Neh. Xiii. 24) 1. Consisting of a moiety, or half; as, a half bushel; a half hour; a half dollar; a half view. The adjective and noun are often united to form a compound. 2. Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect; as, a half dream; half knowledge. "Assumed from thence a half consent." (Tennyson) Half ape, a middle or intermediate tint, as in drawing or painting. See Demitint. Half truth, a statement only partially true, or which gives only a part of the truth. Half year, the space of six moths; one term of a school when there are two terms in a year. Origin: AS. Healf, half, half; as a noun, half, side, part; akin to OS, OFries, & D. Half, G. Halb, Sw. Half, Dan. Halv, Icel. Halfr, Goth. Halbs. Cf. Halve, Behalf. Source: Websters Dictionary (01 Mar 1998) |
| half-a-gram stain | <technique> A lab technique used to detect the presence of members from the bacterial family Legionellaceae in samples of sputum. (09 Oct 1997) |
| 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) |
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