Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «X»:
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Xen- (prefix)
Xen- (prefix): Foreign or other. As in:
Xenoantigen -- An antigen that is found in more than one species.
Xenograft -- A surgical graft of tissue from one species to an unlike species, genus or family.
Xenotransplantation -- Transplantation from one species to a foreign one, e.g., the heart transp...
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Xeno- (prefix)
Xeno- (prefix): Foreign or other. As in:
Xenoantigen -- An antigen that is found in more than one species.
Xenograft -- A surgical graft of tissue from one species an unlike species, genus or family.
Xenotransplantation -- Transplantation from one species to a foreign one, e.g., the heart transpla...
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Xenoantigen
Xenoantigen: An antigen that is found in more than one species. An antigen is something that is capable of inducing an immune response.
The prefix "xeno-" means foreign or other. It comes from the Greek "xenos" meaning stranger, guest, or host....
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Xenobiotic
Xenobiotic: Natural substances that are foreign
to the body....
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Xenograft
Xenograft: A surgical graft of tissue from one species
to an unlike species (or genus or family). A graft from a baboon to a human is a xenograft.
The prefix "xeno-" means foreign. It comes from the Greek
word "xenos" meaning stranger, guest, or host. (Xeno- and xen- are variant forms of the same ...
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Xenotransplantation
Xenotransplantation: Transplantation from one species to a foreign one. The rationale for xenotransplantation has included the short supply of human organs for transplantation.
The first surgeon to do an animal-to-human heart transplant was Dr. James D. Hardy. After doing the first human lung tran...
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Xenotropic virus
Xenotropic virus: A virus that can grow in the cells of a species foreign to the normal host species, a species different from that which normally hosts it.
Xeno- means foreign while -tropic refers to growth. So xeno- + -tropic = capable of growing in a foreign environment....
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Xeric
Xeric: Characterized by a scanty supply of moisture (or tolerating or adapted to dry conditions).
The word "xeric" is derived from "xeros," the Greek word for "dry." "Xeric" was coined in 1926 and was in common scientific usage by the 1940s....
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Xero-
Xero- (prefix): Dry. From the Greek "xeros" meaning "dry." Examples of words containing "xero-" -- xeroderma is dry skin; xerophagia is eating a dry diet; xerophthalmia is dry eye; and xerostomia....
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Xeroderma
Xeroderma: Abnormally dry
skin.
Xeroderma can be
caused by a deficiency of vitamin A, systemic illness, overexposure to
sunlight, or medication.
It can usually be addressed by the use of
over-the-counter (OTC) topical preparations. If these products do not relieve
the condition, see an aesthe...
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Xeroderma pigmentosum
Xeroderma pigmentosum: A genetic disease characterized by such extraordinary sensitivity to sunlight that it results in the development of skin cancer at a very early age. Children with xeroderma pigmentosum (XP) can only play outdoors safely after nightfall. They have been called midnight children,...
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Xerogram
Xerogram: A picture of the body recorded on paper rather than on film. Also called a xeroradiograph.
From the Greek "xeros" meaning "dry."...
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Xeromammography
Xeromammography: Xeroradiography of the breast. Xeroradiography is a photoelectric method of recording an x-ray image on a coated metal plate, using low-energy photon beams, long exposure time and dry chemical developers.
The prefix xero- comes from the Greek "xeros" meaning "dry."...
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Xerophagia
Xerophagia: A dry diet. Literally, dry eating. From the Greek "xeros" meaning "dry" + "phago" meaning "to eat."...
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Xerophthalmia
Xerophthalmia: Dry eyes. Xerophthalmia can be associated with systemic diseases such as Sjogren' s
syndrome, systemic lupus erythematosus, rheumatoid arthritis,
scleroderma, sarcoidosis,
amyloidosis, and hypothyroidism; deficiency of vitamin A; and the use of some medications including antihistami...
