| xenophthalmia | An obsolete term for inflammation excited by the presence of a foreign body in the eye. (05 Mar 2000) |
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| 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) |
| xenopus laevis | The commonest and widest ranging species of the clawed "frog" (xenopus) in africa. This species is used extensively in research. There is now a significant population in california derived from escaped laboratory animals. (12 Dec 1998) |
| xenosome | 1. <marine biology> A bacterial endosymbiont of certain marine protozoans. 2. Inorganic particles in various testate amoebae. Origin: Gr. Soma = body (18 Nov 1997) |
| xenotime | <chemical> A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals. Origin: Gr. Honoring guests or strangers; xenos guest, stranger + honor: cf. G. Xenotim. Source: Websters Dictionary (01 Mar 1998) |
| xenotransplantation | <procedure> The surgical removal of an organ or tissue from one species and transplanting it into a member of a different species, for example: the use of a baboon heart in a human being. (11 May 1997) |
| xenotropic | <virology> Refers to a genetically transmitted retrovirus that cannot replicate in the host species that is harboring it but which can infect and can only replicate in the cells of a dfferent species. (11 May 1997) |
| xenotropic virus | <virology> A virus that can be grown on cells of a species foreign to the normal host species. (18 Nov 1997) |
| xenurine | <zoology> A cabassou. Origin: Gr. Xenos strange + tail. Source: Websters Dictionary (01 Mar 1998) |
| xenyl | <chemistry> The radical characteristic of xenylic compounds. Origin: Gr. Xenos strange + -yl. Source: Websters Dictionary (01 Mar 1998) |
| xenylic | <chemistry> Pertaining to, derived from, designating, certain amido compounds obtained by reducing certain nitro derivatives of diphenyl. Source: Websters Dictionary (01 Mar 1998) |
| xeransis | A gradual loss of moisture in the tissues. Origin: G. Xeransis, fr. Xeros, dry (05 Mar 2000) |
| xerantic | Denoting xeransis. (05 Mar 2000) |