| vitreous cell | A cell occurring in the peripheral part of the vitreous body that may be responsible for production of hyaluronic acid and possibly of collagen. Synonym: hyalocyte. (05 Mar 2000) |
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| vitreous chamber of eye | The large space between the lens and the retina; it is filled with the vitreous body. Synonym: camera vitrea bulbi, vitreous camera, vitreous chamber of eye. (05 Mar 2000) |
| vitreous detachment | Separation of the peripheral vitreous humor from the retina. (05 Mar 2000) |
| vitreous haemorrhage | Haemorrhage into the vitreous body. (12 Dec 1998) |
| vitreous hernia | Prolapse of the vitreous humor into the anterior chamber; may follow removal or displacement of the lens from the lenticular space. (05 Mar 2000) |
| vitreous humor | <ophthalmology> The gel-like substance that fills the eyeball between the lens and the retina. (11 Nov 1997) |
| vitreous lamella | The transparent, nearly structureless inner layer of the choroid in contact with the pigmented layer of the retina. Synonym: basal lamina of choroid, basal layer of choroid, Bruch's membrane, Henle's membrane, lamina vitrea, vitreous lamella, vitreous membrane. (05 Mar 2000) |
| vitreous membrane | A condensation of fine collagen fibres in places in the cortex of the vitreous body; formerly thought to form a membrane or capsule at its periphery. Synonym: lamina basalis choroideae. See: posterior limiting layer of cornea (05 Mar 2000) |
| vitreous table | The inner table of one of the cranial bones; it is more compact and harder than the outer table. Synonym: lamina internal ossium cranii. (05 Mar 2000) |
| vitreum | Synonym: vitreous body. Origin: L. Ntr. Of vitreus, glassy (05 Mar 2000) |
| vitrification | Conversion of dental porcelain (frit) to a glassy substance by heat and fusion. Origin: L. Vitrium, glassy, + facio, to make (05 Mar 2000) |
| vitrina | <zoology> A genus of terrestrial gastropods, having transparent, very thin, and delicate shells, whence the name. Origin: NL, fr. L. Vitrum glass. Source: Websters Dictionary (01 Mar 1998) |
| vitriol | <chemistry> A sulphate of any one of certain metals, as copper, iron, zinc, cobalt. So called on account of the glassy appearance or luster. Sulphuric acid; called also oil of vitriol. So called because first made by the distillation of green vitriol. See Sulphuric acid, under Sulphuric. Blue vitriol. See Blue. Green vitriol, ferrous sulphate; copperas. See Green. Oil of vitriol, sulphuric or vitriolic acid; popularly so called because it has the consistency of oil. Red vitriol, a native sulphate of cobalt. Vitriol of Mars, ferric sulphate, a white crystalline substance which dissolves in water, forming a red solution. White vitriol, zinc sulphate, a white crystalline substance used in medicine and in dyeing. It is usually obtained by dissolving zinc in sulphuric acid, or by roasting and oxidizing certain zinc ores. Formerly called also vitriol of zinc. Origin: F. Vitriol; cf. Pr. Vitriol, vetriol, Sp. & Pg. Vitriolo, It. Vitriuolo; fr. L. Vitreolus of glass, vitreus vitreous. See Vitreous. Source: Websters Dictionary (01 Mar 1998) |
| vitriolate | <chemistry> To convert into, or change to, a vitriol; to make into sulphuric acid or a sulphate. To subject to the action of, or impregnate with, vitriol. Origin: Vitriolated; Vitriolating. <chemistry> A sulphate. Source: Websters Dictionary (01 Mar 1998) |
| vitriolated | <chemistry> Changed into a vitriol or a sulphate, or subjected to the action of sulphuric acid or of a sulphate; as, vitriolated potash, i. E, potassium sulphate. Source: Websters Dictionary (01 Mar 1998) |
| vital signs |
Referring to temperature, pulse, and respiration.
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| vitamin |
A key nutrient that the body needs in small amounts to grow and stay strong. Examples are vitamins A, C, and E.
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| vitamin A |
A substance used in cancer prevention. It belongs to the family of drugs called retinoids.
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| vitamin E |
A substance used in cancer prevention. It belongs to the family of drugs called tocopherols.
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| vitamin K |
A substance that promotes the clotting of blood.
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