| primate diseases | Diseases of animals within the order primates. This term includes diseases of haplorhini and strepsirhini. (12 Dec 1998) |
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| Primates | The highest order of mammals, including man, monkeys, and lemurs. Origin: L. Primus, first (05 Mar 2000) |
| prime | 1. First in order of time; original; primeval; primitive; primary. "Prime forests." "She was not the prime cause, but I myself." (Milton) In this sense the word is nearly superseded by primitive, except in the phrase prime cost. 2. First in rank, degree, dignity, authority, or importance; as, prime minister. "Prime virtues." 3. First in excellence; of highest quality; as, prime wheat; a prime quality of cloth. 4. Early; blooming; being in the first stage. "His starry helm, unbuckled, showed him prime In manhood where youth ended." (Milton) 5. Lecherous; lustful; lewd. 6. Marked or distinguished by a mark (') called a prime mark. Prime and ultimate ratio. <mathematics> The vertical circle which passes through the east and west points of the horizon. Prime-vertical dial, a dial in which the shadow is projected on the plane of the prime vertical. Prime-vertical transit instrument, a transit instrument the telescope of which revolves in the plane of the prime vertical, used for observing the transit of stars over this circle. Origin: F, fr. L. Primus first, a superl. Corresponding to the compar. Prior former. See Prior, Foremost, Former, and cf. Prim, Primary, Prince. 1. The first part; the earliest stage; the beginning or opening, as of the day, the year, etc.; hence, the dawn; the spring. "In the very prime of the world." (Hooker) "Hope waits upon the flowery prime." (Waller) 2. The spring of life; youth; hence, full health, strength, or beauty; perfection. "Cut off in their prime." . "The prime of youth." 3. That which is first in quantity; the most excellent portion; the best part. "Give him always of the prime." (Swift) 4. [F. Prime, LL. Prima (sc. Hora). See Prime] The morning; specifically, the first canonical hour, succeeding to lauds. "Early and late it rung, at evening and at prime." (Spenser) Originally, prime denoted the first quarter of the artificial day, reckoned from 6 a. M. To 6 p. M. Afterwards, it denoted the end of the first quarter, that is, 9 a. A. Specifically, it denoted the first canonical hour, as now. Chaucer uses it in all these senses, and also in the sense of def. 1, above. "They sleep till that it was pryme large." (Chaucer) 5. The first of the chief guards. 6. <chemistry> Any number expressing the combining weight or equivalent of any particular element; so called because these numbers were respectively reduced to their lowest relative terms on the fixed standard of hydrogen as 1. 7. <mathematics> A prime number. See Prime. 8. An inch, as composed of twelve seconds in the duodecimal system; denoted by ['] See Inch. Prime of the moon, the new moon at its first appearance. 1. To apply priming to, as a musket or a cannon; to apply a primer to, as a metallic cartridge. 2. To lay the first colour, coating, or preparation upon (a surface), as in painting; as, to prime a canvas, a wall. 3. To prepare; to make ready; to instruct beforehand; to post; to coach; as, to prime a witness; the boys are primed for mischief. 4. To trim or prune, as trees. 5. <mathematics> To mark with a prime mark. To prime a pump, to charge a pump with water, in order to put it in working condition. Origin: From Prime. Source: Websters Dictionary (01 Mar 1998) |
| primer | Short pre-existing polynucleotide chain towhich new deoxyribonucleotides can be added by DNA polymerase. (09 Oct 1997) |
| primer extension | A technique for determining the 5'-untranslated region of a specific mRNA molecule. Uses an oligonucleotide complementary to the known RNA sequence as a primer for cDNA synthesis via reverse transcriptase. (05 Mar 2000) |
| primerite | Synonym: protomerite. Origin: L. Primus, first, + G. Meros, part (05 Mar 2000) |
| primerole | <botany> See Primrose. "She was a primerole." Source: Websters Dictionary (01 Mar 1998) |
| primidone | This prescription drug is used to treat convulsions and seizures. (09 Oct 1997) |
| primigravida | See: gravida. Origin: L. Fr. Primus, first, + gravida, a pregnant woman (05 Mar 2000) |
| primine | <botany> The outermost of the two integuments of an ovule. This word has been used by some writers to denote the inner integument, which is formed earlier than the outer. Cf. Secundine. Origin: L. Primus first: cf. F. Primine. Source: Websters Dictionary (01 Mar 1998) |
| priming | Treatment that does not in itself elicit a response from a system but that induces a greater capacity to respond to a second stimulus. (18 Nov 1997) |
| primipara | <medicine> A woman who bears a child for the first time. Origin: L, fr. Primus first + parere to bring forth. Source: Websters Dictionary (01 Mar 1998) |
| primiparity | Condition of being a primipara. (05 Mar 2000) |
| primiparous | Denoting a primipara. (05 Mar 2000) |
| primipilar | Of or pertaining to the captain of the vanguard of a Roman army. Origin: L. Primipilaris, fr. Primipilus the centurion of the first cohort of a Roman legion, fr. Primus pilus the division made up of the triarii in the Roman army. Source: Websters Dictionary (01 Mar 1998) |
| primitive aorta |
primordial aorta, either of two main vascular trunks before fusion into a single aorta in the early embryo.
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| primitive circulation |
primordial circulation, the earliest circulation by which nutriment and oxygen are conveyed to the embryo; called also first c.
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| primordial cyst |
a relatively uncommon type of odontogenic cyst that develops through cystic degeneration and liquefaction of the stellate reticulum in an enamel organ before any calcified enamel or dentin has been formed. Such cysts originate from supernumerary teeth, and are found in place of a tooth rather than being associated with one.
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| prion protein |
(PrP) a 33?5 kD protein of uncertain function, in humans coded for by a gene on the short arm of chromosome 20. The 27?0 kD protease-resistant core is the functional, and perhaps only, component of prions; several isoforms have been identified and are responsible for prion disease. Extracellular prion protein aggregates into rod-shaped structures that resemble amyloid.
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| primary cataract |
a cataract developing independently of any other disease.
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| PRI | a preliminary election where delegates or nominees are chosen |
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| PRI | one of the main flight feathers projecting along the outer edge of a bird's wing |
| PRI | coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit |
| PRI | not derived from or reducible to something else |
| PRI | of primary importance |
| PRI | most important element |
| PRI | of first rank or importance or value |
| PRI | of or being the essential or basic part |
| PRI | delay of menarche beyond age 18 |
| PRI | an acute respiratory disease marked by high fever and coughing |
| PRI | an electric cell that generates an electromotive force by an irreversible conversion of chemical to electrical energy |
| PRI | armed forces censorship performed by personnel of a military unit on the personal communications of persons assigned to that unit |