| paraduodenal fold | A sickle-shaped fold of peritoneum sometimes found arching between the left side of the duodenojejunal flexure and the medial border of the left kidney; its right free edge contains the ascending branch of the left colic artery and inferior mesenteric vein; forms anterior boundary of the paraduodenal recess. See: paraduodenal recess. Synonym: plica paraduodenalis, Treitz's arch. (05 Mar 2000) |
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| paraduodenal fossa | An occasional recess in the peritoneum to the left of the terminal portion of the duodenum located behind a fold containing the inferior mesenteric vein. Synonym: recessus paraduodenalis, fossa venosa, paraduodenal fossa. (05 Mar 2000) |
| paraduodenal hernia | A type of internal hernia, resulting from abnormal or incomplete midgut rotation, which involves one of several paraduodenal spaces. (05 Mar 2000) |
| paraduodenal recess | An occasional recess in the peritoneum to the left of the terminal portion of the duodenum located behind a fold containing the inferior mesenteric vein. Synonym: recessus paraduodenalis, fossa venosa, paraduodenal fossa. (05 Mar 2000) |
| paradysentery bacillus | A bacterium which is one of the aetiologic agents of bacillary dysentery (dysentery, bacillary) and sometimes of infantile gastroenteritis. (12 Dec 1998) |
| paraesophageal hernia | A non-sliding hernia through or adjacent to the oesophageal hiatus of the diaphragm; most commonly contains stomach and other abdominal viscera. (05 Mar 2000) |
| paraesophageal hiatal hernia | <radiology> Rolling hiatal hernia, parahiatal hernia, 1% of hiatal hernias, portion of stomach superiorly displaced into the thorax with the oesophagogastric junction remaining in the subdiaphragmatic position Findings: cardia in normal position, herniation of portion of the stomach anterior to oesophagus, frequently nonreducible, may be associated with gastric ulcer of lesser curvature at level of diaphragmatic hiatus (12 Dec 1998) |
| paraesthesia | <neurology> Morbid or perverted sensation, an abnormal sensation, as burning, prickling, formication, etc. Origin: Gr. Aisthesis = perception (18 Nov 1997) |
| paraffin | <chemical> A mixture of solid hydrocarbons obtained from petroleum. It has a wide range of uses including as a stiffening agent in ointments, as a lubricant, and as a topical anti-inflammatory. It is also commonly used as an embedding material in histology. Pharmacological action: anti-inflammatory agent, topical, pharmaceutic aid, sclerosing solutions. Chemical name: Paraffin waxes and Hydrocarbon waxes (12 Dec 1998) |
| paraffin cancer | Carcinoma of the skin occurring as an occupational disease in paraffin workers. (05 Mar 2000) |
| paraffin embedding | The infiltrating of tissue specimens with paraffin, as a supporting substance, to prepare for sectioning with a microtome. (12 Dec 1998) |
| paraffin tumour | A tumefaction, usually a granuloma, caused by the prosthetic or therapeutic injection of paraffin into the tissues; sometimes used with reference to similar lesions resulting from the injection of any oil, wax, or the like. See: lipogranuloma. Synonym: paraffin tumour. (05 Mar 2000) |
| paraffin wax | A wax derived from petroleum. Synonym: mineral wax. (05 Mar 2000) |
| paraffine | <chemistry> A white waxy substance, resembling spermaceti, tasteless and odorless, and obtained from coal tar, wood tar, petroleum, etc, by distillation. It is used as an illuminant and lubricant. It is very inert, not being acted upon by most of the strong chemical reagents. It was formerly regarded as a definite compound, but is now known to be a complex mixture of several higher hydrocarbons of the methane or marsh-gas series; hence, by extension, any substance, whether solid, liquid, or gaseous, of the same chemical series; thus coal gas and kerosene consist largely of paraffins. In the present chemical usage this word is spelt paraffin, but in commerce it is commonly spelt paraffine. Native paraffin. See Ozocerite. Paraffin series. See Methane series, under Methane. Origin: F. Paraffine, fr. L. Parum too little + affinis akin. So named in allusion to its chemical inactivity. Source: Websters Dictionary (01 Mar 1998) |
| paraffinoma | A tumefaction, usually a granuloma, caused by the prosthetic or therapeutic injection of paraffin into the tissues; sometimes used with reference to similar lesions resulting from the injection of any oil, wax, or the like. See: lipogranuloma. Synonym: paraffin tumour. (05 Mar 2000) |