| 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) |
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| 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) |