| ascending process | An upward extension of the embryonic pterygoquadrate cartilage; it develops into the greater wing of the sphenoid bone. Synonym: ascending process. (05 Mar 2000) |
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| ascending pyelonephritis | Pyelonephritis due to bacterial infection from the lower urinary tract, particularly by reflux of infected urine. (05 Mar 2000) |
| ascending tick paralysis | <neurology> An ascending paralysis caused by the continued presence of Dermacentor and Ixodes ticks attached to the occipital or upper neck region in humans. The treatment consists of tick removal and supportive care. (27 Sep 1997) |
| ascension | 1. The act of ascending; a rising; ascent. 2. Specifically: The visible ascent of our Savior on the fortieth day after his resurrection. Also, Ascension Day. 3. An ascending or arising, as in distillation; also that which arises, as from distillation. "Vaporous ascensions from the stomach." (Sir T. Browne) Ascension Day, the Thursday but one before Whitsuntide, the day on which commemorated our Savior's ascension into heaven after his resurrection; called also Holy Thursday. <astronomy> Right ascension, an arc of the equator, intercepted between the first point of Aries and that point of the equator which rises together with a star, in an oblique sphere; or the arc of the equator intercepted between the first point of Aries and that point of the equator that comes to the horizon with a star. It is little used in modern astronomy. Origin: F. Ascension, L. Ascensio, fr. Ascendere. See Ascend. Source: Websters Dictionary (01 Mar 1998) |
| ascensional | Relating to ascension; connected with ascent; ascensive; tending upward; as, the ascensional power of a balloon. <astronomy> Ascensional difference, the difference between oblique and right ascension; used chiefly as expressing the difference between the time of the rising or setting of a body and six o'clock, or six hours from its meridian passage. Source: Websters Dictionary (01 Mar 1998) |
| ascensus | A moving upward; having an abnormally high position. Origin: L. Ascent (05 Mar 2000) |
| ascertainment | In epidemiological and genetic research, the method by which a person, pedigree, or cluster is brought to the attention of an investigator; has a bearing on the interpretation of segregation ratios, concordance rates, linkage analysis, and other probability features. (05 Mar 2000) |
| ascetic | In the early church, one who devoted himself to a solitary and contemplative life, characterised by devotion, extreme self-denial, and self-mortification; a hermit; a recluse; hence, one who practices extreme rigor and self-denial in religious things. "I am far from commending those ascetics that take up their quarters in deserts." (Norris) Ascetic theology, the science which treats of the practice of the theological and moral virtues, and the counsels of perfection. Source: Websters Dictionary (01 Mar 1998) |
| Aschelminthes | A former phylum of the Metazoa which included the class Nematoda and a disparate assortment of other pseudocelomates, each now accorded separate phylum status; they are nonsegmented, bilaterally symmetric, and cylindric or filiform, with a pseudocele body cavity and rounded or pointed ends; they vary considerably in size, and the male is usually smaller than the female. (05 Mar 2000) |
| Ascher's aqueous influx phenomenon | The filling of the aqueous vein, which normally carries blood and aqueous, with aqueous, when the junction of the aqueous vein and the recipient vein is partially occluded. Synonym: Ascher's aqueous influx phenomenon. (05 Mar 2000) |
| Ascher's syndrome | <syndrome> A condition in which a congenital double lip is associated with blepharochalasis and nontoxic thyroid gland enlargement. (05 Mar 2000) |
| Ascher, Karl | <person> U.S. Ophthalmologist, 1887-1971. See: Ascher's aqueous influx phenomenon, Ascher's syndrome. (05 Mar 2000) |
| Aschheim, Selmar | <person> German obstetrician and gynecologist, 1878-1965. See: Aschheim-Zondek test. (05 Mar 2000) |
| Aschheim-Zondek test | An obsolete test for pregnancy; repeated injections of small quantities of urine voided during the first months of pregnancy produce in infantile mice, within 100 hours, minute intrafollicular ovarian haemorrhages, and the development of lutein cells. Synonym: A.-Z. Test, Zondek-Aschheim test. (05 Mar 2000) |
| Aschner's phenomenon | A decrease in pulse rate associated with traction on extraocular muscles or compression of the eyeball; especially sensitive in children; may produce asystolic cardiac arrest. Synonym: Aschner's phenomenon, Aschner's reflex, Aschner-Dagnini reflex, oculovagal reflex. (05 Mar 2000) |