| pre- | Anterior; before (in time or space). See: ante-, pro-. Origin: L. Prae (05 Mar 2000) |
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| pre-B lymphocyte | An early B-lymphoid type cell that is recognised by immunofluorescence as a u-positive, L-chain-negative bone marrow cell. (05 Mar 2000) |
| pre-embryo | <embryology> A fertilized egg in the early stage of development prior to cell division. (31 Dec 1997) |
| pre-excitation syndromes | Conditions characterised by activation of the whole or some part of the ventricle by the atrial impulse earlier than would be expected if the impulse reached the ventricle by way of the normal specific conduction system only. (12 Dec 1998) |
| pre-excitation, mahaim-type | A form of pre-excitation characterised by a normal pr interval and a long qrs interval with a delta wave. (12 Dec 1998) |
| pre-oedipal phase | In psychoanalysis, the collective phase's of psychosexual development preceding the oedipal phase. (05 Mar 2000) |
| pre-ribosomal RNA endoribonuclease | <enzyme> Substrate is pre-rrna Registry number: EC 3.1.26.- Synonym: pre-rrna endoribonuclease (26 Jun 1999) |
| pre-Rolandic artery | <anatomy, artery> A branch of the terminal part of the middle cerebral artery distributed to the cortex on either side of the precentral sulcus. Synonym: arteria sulci precentralis, artery of precentral sulcus, pre-Rolandic artery, precentral artery. (05 Mar 2000) |
| pre-steady state | Those conditions and the time interval prior to establishment of steady state. (05 Mar 2000) |
| preacher | 1. One who preaches; one who discourses publicly on religious subjects. "How shall they hear without a preacher?" (Rom. X. 14) 2. One who inculcates anything with earnestness. "No preacher is listened to but Time. <zoology>" (Swift) Preacher bird, a toucan. Origin: Cf. OF. Preeschierre, prescheur, F. Precheur, L. Praedicator. Source: Websters Dictionary (01 Mar 1998) |
| preagonal | Immediately preceding death. Origin: pre-+ G. Agon, struggle (agony) (05 Mar 2000) |
| prealbumin | A tetrameric protein, molecular weight between 50,000 and 70,000, consisting of 4 equal chains, and migrating on electrophoresis in 3 fractions more mobile than serum albumin. Its concentration ranges from 7 to 33 per cent in the serum, but levels decrease in liver disease. (12 Dec 1998) |
| preanal | Anterior to the anus. (05 Mar 2000) |
| preanesthetic | Before anaesthesia. (05 Mar 2000) |
| preanesthetic medication | Drugs administered prior to an anaesthetic to decrease anxiety and to obtain a smoother induction of, maintenance of, and emergence from anaesthesia. (05 Mar 2000) |
| dizziness, pre-syncopal | Syncope is fainting. Pre-syncope is before fainting, whedn one is about to faint. Some symptoms of dizziness such as wooziness, feeling about to black out, and tunnel vision may be pre-syncopal and are due to insufficient blood flow to the brain. These symptoms are typically worse when standing, improve with lying down and may be experienced by healthy individuals who rise quickly from a chair, often after a meal, and have a few seconds of disorientation. (12 Dec 1998) |
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| 3'-pre-tRNase | <enzyme> Processes the 3'-terminus of human pre-trna(met)(i) Registry number: EC 3.1.27.- (26 Jun 1999) |
| 5'-pre-tRNA endonuclease | <enzyme> Processes the 5' leader from primary transcript of human trna(met)(i)gene Registry number: EC 3.1.26.- (26 Jun 1999) |