medium /me·di·um/ (me´de-um) pl. mediums, me´dia [L.]
medium
medium (mē´dēum),
medium
1. a substance that transmits impulses.
2. culture medium; see under C.
3. a preparation used in treating histologic specimens.
active medium the aggregated atoms, ions, or molecules contained in a laser's optical cavity, in which stimulated emission will occur under the proper excitation.
clearing medium a substance to render histologic specimens transparent.
contrast medium a radiopaque substance used in radiography to permit visualization of internal body structures.
culture medium see under C.
dioptric media refracting media.
disperse medium , dispersion medium, dispersive medium the continuous phase of a colloid system; the medium in which the particles of the disperse phase are distributed, analogous to the solvent in a true solution.
nutrient medium a culture medium to which nutrient materials have been added.
refracting media the transparent tissues and fluid in the eye through which light rays pass and by which they are refracted and focused on the retina.
me·di·um (m  d- m)n. pl. me·di·ums or me·di·a (-d -) 1. Something, such as an intermediate course of action, that occupies a position or represents a condition midway between extremes. 2. An intervening substance through which something else is transmitted or carried on. 3. An agency by which something is accomplished, conveyed, or transferred. 4. The substance, often nutritive, in which a specific organism lives and thrives. 5. A culture medium. 6. A filtering substance, such as filter paper. adj. Occurring or being between two degrees, amounts, or quantities; intermediate. |
medium
a substance through which something moves or through which it acts. A contrast medium is a substance that has a density different from that of body tissues, permitting visual comparison of structures when used with imaging techniques such as x-ray film. A culture medium is a substance that provides a nutritional environment for the growth of microorganisms or cells. A dispersion medium is the substance in which a colloid is dispersed. A refractory medium is the transparent tissues and fluid of the eye that refract light.
medium (mē´dēum),
n an interposed agent or material; a carrier; a material serving as an environment for the growth of microorganisms.
medium, computer,
n the material on which data are recorded (e.g., CD-RWs, DVDs, external hard drives, magnetic tape).
medium, marking,
n 1. an agent, such as carbon paper or inked ribbon, used to indicate an occlusal interference.
n 2. an agent, such as stencil correction fluid, rouge and alcohol, or pressure indicator paste, used to determine areas of interference or pressure related to a removable prosthesis.
n 2. an agent, such as stencil correction fluid, rouge and alcohol, or pressure indicator paste, used to determine areas of interference or pressure related to a removable prosthesis.
medium, radiopaque,
n a substance that may be injected into a cavity or region to increase its density in radiographic examination and thereby aid in diagnosis. Lipiodol, Iodochloral, Parabodril, and Ioduron are examples of such materials.
medium, Sabouraud's,
n.pr a nutrient agar used to grow fungi. It is especially useful for the growth and identification of
C. albicans, the causative agent of thrush.
C. albicans, the causative agent of thrush.
medium, separating,
n a coating that is used on a surface and serves to prevent another surface or material from adhering to the first (e.g., tinfoil, cellophane, or alginate, all of which are used to protect an acrylic resin from the moisture in the gypsum mold).
medium
pl. media, mediums [L.]
1. an agent by which something is accomplished or an impulse is transmitted.
2. a substance providing the proper nutritional environment for the growth of microorganisms; called also culture medium.
basic nutritive medium
one adequate for the growth requirements of most bacteria.
contrast medium
a radiopaque (positive) substance, or (negative) gases used in radiography to permit visualization of body structures.
culture medium
a substance used to support the growth of microorganisms or other cells.
dioptric medium
refracting medium (see below).
disperse medium, dispersion medium
the continuous phase of a colloid system; the medium in which a colloid is dispersed, corresponding to the solvent in a true solution.
enriched medium
modification of a basic medium for the growth of fastidious bacteria. Common additions are blood, serum or egg yolk.
indicator medium
a type of bacteriological medium which may contain a fermentable sugar plus a pH indicator that gives a color change. It is used to identify bacteria on the basis of a characteristic biochemical reaction.
refracting medium
the transparent tissues and fluid in the eye through which light rays pass and by which they are refracted and brought to a focus on the retina.
medium sausage
a technique for examining meat for bacterial contamination. The solid medium is made up in the form of a sausage and slices are removed from it after application of the exposed end to the suspect meat.
selective medium
formulated to facilitate the isolation of specific bacteria, they contain substances to inhibit growth of others.
transport medium
formulated to preserve a specimen, usually tissue or microbiological swab, and minimize bacterial overgrowth for the time necessary to transport it to the laboratory.
medium
Imaging A substance used to enhance imaging of a particular structure. See Contrast medium, High-osmolality contrast medium, Low-osmolality contrast medium, Informatics A material on which data is stored. See Magnetic medium, Multimedia, Output medium.
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