| paeony | <botany> See Peony. Source: Websters Dictionary (01 Mar 1998) |
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| PaeR7I invertase | <enzyme> A DNA-invertase-like enzyme from pseudomonas; has 45-49% amino acid sequence similarity to various DNA invertases; mw 21.5 kD; amino acid sequence given in first source Registry number: EC 2.7.7.- Synonym: paer7in gene product, paer7in (26 Jun 1999) |
| PAF | <abbreviation> Platelet-aggregating factor. (05 Mar 2000) |
| page | 1. One side of a leaf of a book or manuscript. "Such was the book from whose pages she sang." (Longfellow) 2. A record; a writing; as, the page of history. 3. The type set up for printing a page. Origin: F, fr. L. Pagina; prob. Akin to pagere, pangere, to fasten, fix, make, the pages or leaves being fastened together. Cf. Pact, Pageant, Pagination. 1. A serving boy; formerly, a youth attending a person of high degree, especially at courts, as a position of honor and education; now commonly, in England, a youth employed for doin errands, waiting on the door, and similar service in households; in the United States, a boy emploed to wait upon the members of a legislative body. "He had two pages of honor on either hand one." (Bacon) 2. A boy child. 3. A contrivance, as a band, pin, snap, or the like, to hold the skirt of a woman's dress from the ground. 4. A track along which pallets carrying newly molded bricks are conveyed to the hack. 5. <zoology> Any one of several species of beautiful South American moths of the genus Urania. Origin: F, fr. It. Paggio, LL. Pagius, fr. Gr, dim. Of, a boy, servant; perh. Akin to L. Puer. Cf. Pedagogue, Puerile. Source: Websters Dictionary (01 Mar 1998) |
| page kidney | <radiology> Renal compression most likely to be hypertension, mediated by renin-angiotensin system, aetiology: haematoma (posttraumatic) -- most common, cyst, tumour, on angio: stretching and splaying of intrarenal vessels (12 Dec 1998) |
| pageant | 1. A theatrical exhibition; a spectacle. "A pageant truly played." "To see sad pageants of men's miseries." (Spenser) 2. An elaborate exhibition devised for the entertainmeut of a distinguished personage, or of the public; a show, spectacle, or display. "The gaze of fools, and pageant of a day !" (Pope) "We love the man, the paltry pageant you." (Cowper) Origin: OE. Pagent, pagen, originally, a movable scaffold or stage, hence, what was exhibited on it, fr. LL. Pagina, akin to pangere to fasten; cf. L. Pagina page, leaf, slab, compaginare to join together, compages a joining together, structure. See Pact, Page of a book. Source: Websters Dictionary (01 Mar 1998) |
| Pagenstecher's circle | In the case of a freely movable abdominal tumour, the mass is moved throughout its entire range, its position at intervals being marked on the abdominal wall; when these points are joined, a circle is formed, the centre of which marks the point of attachment of the tumour. (05 Mar 2000) |
| Pagenstecher, Alexander | <person> German ophthalmologist, 1828-1879. See: Pagenstecher's circle. (05 Mar 2000) |
| paget disease | <radiology> Disease of unknown aetiology involving destruction and reparation, age greater than 40y; M:F 2:1, skull, osteoporosis circumscripta (outer table destroyed only), cotton wool appearance, increased hat size!, spine, monostotic vertebral involvment usually, pelvis, affected in 2/3 cases, consists of cortical thickening, enlargement of pubis/ischium, coarse trabecular pattern, extremities, blade of grass appearance, elevation of alk phos (up to 20X), normal calcium, normal phosphorus, complications: path fractures in 8% cases (usually femur = shepard's crook), malignant degeneration (usually osteosarcoma-50%, fibrosarcoma-25%) (12 Dec 1998) |
| paget disease of breast | <radiology> Form of ductal carcinoma, associated with eczematous changes of the nipple (12 Dec 1998) |
| Paget's cells | Relatively large, neoplastic epithelial cell's (carcinoma cell's) with hyperchromatic nuclei and palely staining cytoplasm; in Paget's disease of the breast, such cell's occur in neoplastic epithelium in the ducts and in the epidermis of the nipple, areola, and adjacent skin. (05 Mar 2000) |
| Paget's disease | <disease, rheumatology> This is a disease of bone that initially results in the excessive resorption of bone (by osteoclasts) followed by the replacement of normal bone marrow with vascular and fibrous tissue. Many patients are asymptomatic and diagnosed by routine X-rays. (13 Nov 1997) |
| Paget's disease of the nipple | <oncology, tumour> A cancer of the nipple. (16 Dec 1997) |
| paget's disease, extramammary | A rare cutaneous neoplasm that occurs in the elderly. It develops more frequently in women and predominantly involves apocrine gland-bearing areas, especially the vulva, scrotum, and perianal areas. The lesions develop as erythematous scaly patches that progress to crusted, pruritic, erythematous plaques. The clinical differential diagnosis includes squamous cell carcinoma in situ and superficial fungal infection. It is generally thought to be an adenocarcinoma of the epidermis, from which it extends into the contiguous epithelium of hair follicles and eccrine sweat ducts. (devita jr et al., cancer: principles & practice of oncology, 3d ed, p1478) (12 Dec 1998) |
| paget's disease, mammary | An intraductal carcinoma of the breast extending to involve the nipple and areola, characterised clinically by eczema-like inflammatory skin changes and histologically by infiltration of the dermis by malignant cells (paget's cells). (12 Dec 1998) |