| xenograft | <surgery> A surgical graft of tissue from one species onto or into individuals of unlike species, genus or family. Also know as a heteroplastic graft. See: xenotransplantation. (11 May 1997) |
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| xenomania | <psychiatry> A mania for, or an inordinate attachment to, foreign customs, institutions, manners, fashions, etc. Origin: Gr. Xenos strange + E. Mania. Source: Websters Dictionary (01 Mar 1998) |
| xenomi | <zoology> A suborder of soft-rayed fresh water fishes of which the blackfish of Alaska (Dallia pectoralis) is the type. Origin: NL, from Gr. Xenos strange. Source: Websters Dictionary (01 Mar 1998) |
| xenon | <chemical> A noble gas with the atomic symbol xe, atomic number 54, and atomic weight 131.30. It is found in the earth's atmosphere and has been used as an anaesthetic. Pharmacological action: anaesthetics, inhalation. Chemical name: Xenon (12 Dec 1998) |
| xenon 133 | <radiology> Xe-133, half-life: 5.2 days, 80 keV photon, dose for V/Q imaging = 20 mCi Cf: other lung ventilation agents (12 Dec 1998) |
| xenon isotopes | Stable xenon atoms that have the same atomic number as the element xenon, but differ in atomic weight. Xe-124, 126, 128-131, 134, and 136 are stable xenon isotopes. (12 Dec 1998) |
| xenon radioisotopes | Unstable isotopes of xenon that decay or disintegrate emitting radiation. Xe atoms with atomic weights 121-123, 125, 127, 133, 135, 137-145 are radioactive xenon isotopes. (12 Dec 1998) |
| xenon-133 | A radioisotope of xenon with a gamma emission at 81 keV and a physical half-life of 5.243 days; used in the study of pulmonary function and organ blood flow. (05 Mar 2000) |
| xenoparasite | An ecoparasite that becomes pathogenic in consequence of weakened resistance on the part of its host. (05 Mar 2000) |
| xenophobia | <psychology> Morbid fear of strangers. Origin: xeno-+ G. Phobos, fear (05 Mar 2000) |
| xenophonia | A speech defect marked by an alteration in accent and intonation. Origin: xeno-+ G. Phone, voice (05 Mar 2000) |
| xenophthalmia | An obsolete term for inflammation excited by the presence of a foreign body in the eye. (05 Mar 2000) |
| Xenopsylla | The rat flea; a genus of fleas parasitic on the rat and involved in the transmission of bubonic plague. The species Xenopsylla cheopis serves as a potent vector of Yersinia pestis, largely because its gut becomes "blocked" by a mass of Y. Pestis cells which prevents the flea from feeding normally, so that it is inclined to attack man and other hosts; it is an important source of infection in traditional epidemic areas such as India. Xenopsylla astia and Xenopsylla braziliensis are also efficient vectors of plague. Origin: xeno-+ G. Psylla, flea (05 Mar 2000) |
| xenopterygii | <zoology> A suborder of fishes including Gobiesox and allied genera. These fishes have soft-rayed fins, and a ventral sucker supported in front by the pectoral fins. They are destitute of scales. Origin: NL, from Gr. Xenos strange +, dim. Of a wing. Source: Websters Dictionary (01 Mar 1998) |
| Xenopus | <molecular biology> The genus of African clawed toads, X. Laevis is widely used in developmental biology and was formerly used in pregnancy diagnosis. Ovulates easily under influence of luteinising hormone. (18 Nov 1997) |