| Xiphophorus test | A rarely used test for androgenic activity, based upon the fact that androgens cause the development of the sword, a male structure, in female swordfish (Xiphophorus helleri) Synonym: Xiphophorus test. (05 Mar 2000) |
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| xiphophyllous | <botany> Having sword-shaped leaves. Origin: Gr. Xifos sword + leaf. Source: Websters Dictionary (01 Mar 1998) |
| xiphura | <zoology> Same as Limuloidea. Called also Xiphosura. X ray. See Ray. Origin: NL, from Gr. Xifos sword + tail. Source: Websters Dictionary (01 Mar 1998) |
| XMP | <abbreviation> Xanthosine 5'-monophosphate. (05 Mar 2000) |
| XO female | The genetic female in Turner's syndrome, where the criterion is the macroscopic appearance of the external genitals. (05 Mar 2000) |
| XO syndrome | <syndrome> A rare genetic disorder (1 in 3,000 births) in women that is characterised by the absence of an X chromosome. This disorder inhibits normal sexual development and causes infertility. Features include webbing of the neck, short stature, retarded development of secondary sex characteristics, absence of menses, coarctation of the aorta, low hairline, eye abnormalities (drooping eyelids) and skeletal deformities. Treatment include oestrogen supplementation at puberty. Growth hormone replacement may be necessary in some cases. Cardiac surgery may be necessary to correct coarctation of the aorta. (27 Sep 1997) |
| Xolloid metalloproteinase | <enzyme> Tolloid-like protein from xenopus with development-regulating activity; acts as a ventralizing agent that mimics low doses of bone morphogenetic protein-4 Registry number: EC 3.4.24.- Synonym: xolloid gene product (26 Jun 1999) |
| XTP | <abbreviation> Xanthosine 5'-triphosphate. (05 Mar 2000) |
| XX male | A clear male phenotype in the presence of a 46,XX karyotype; presumably the vital parts of the Y chromosome are located elsewhere in the genome as a result of translocation at least in some of these persons. (05 Mar 2000) |
| XXX female | See: triple X syndrome. (05 Mar 2000) |
| XXY male | See: Klinefelter's syndrome. (05 Mar 2000) |
| XXY syndrome | <syndrome> A condition characterised by small testes with hyalinization of the seminiferous tubules, variable degrees of masculinization, azoospermia and infertility, and increased urinary excretion of gonadotropin. Patients tend to be tall, with long legs, and about half have gybecomastia. It is associated typically with an xxy chromosome complement, although variants include xxyy, xxxy, xxxxy, and several mosaic patterns (xy/xxy, xxy, xxxy, etc.). (12 Dec 1998) |
| Xy | <abbreviation> Xylose. (05 Mar 2000) |
| Xyl | <abbreviation> Xylose. (05 Mar 2000) |
| xylamide | <chemistry> An acid amide derivative of xylic acid, obtained as a white crystalline substance. Origin: Xylic + amide. Source: Websters Dictionary (01 Mar 1998) |
| xerophthalmia |
(xe
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| xeroradiography |
(xe
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| xiph- |
(xiph(o)-) [Gr. xiphos sword] a combining form denoting relationship to the xiphoid process. Also, xiphi-.
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| xerosis |
(xe
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| xiphisternal |
(xiphi
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| X | being severn more than thirty |
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| X | being eight more than thirty |
| X | (genetics) abnormal complement of sex hormones in a male resulting in Klinefelter's syndrome |
| X | syndrome in males that is characterized by small testes and long legs and enlarged breasts and reduced sperm production and mental retardation |
| X | (genetics) normal complement of sex hormones in a male |
| X | type genus of Xylariaceae |
| X | fungus causing black root rot in apples |
| X | the fruiting bodies of the fungi of the genus Xylaria |
| X | family of fungi characterized by dark brown to back spores |
| X | the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels |
| X | a colorless flammable volatile liquid hydrocarbon used as a solvent |
| X | a local anesthetic (trade names Lidocaine and Xylocaine) used topically on the skin and mucous membranes |