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actinic of or pertaining to the chemical property of ultraviolet radiation and x-rays that produces photochemical effects.
actinic rays electromagnetic radiation, such as x-rays or ultraviolet light, that can produce an image on a photographic emulsion.
algebraic fraction a fraction that has at least one algebraic variable or expression in the numerator or denominator, such as 1/x.
angiogram an x-ray image of blood vessels that is taken after injecting a substance that absorbs x-rays into the blood.
arteriography examination of the arteries by x-ray after injection with a radiopaque dye.
barium sulfate an opaque insoluble white powder that is used as a pigment in paints and a filler for plastics and textiles, and is swallowed as a diagnostic aid in x-ray examination of the stomach and intestines.
bremsstrahlung electromagnetic radiation, such as x-rays, produced by the sudden deceleration or acceleration of an electron caused by its approach to an atomic nucleus.
CAT scan a cross-sectional image formed by a computerized combination of x-rays taken along a selected axis of the body, used as a diagnostic tool in medical treatment; computerized axial tomography scan.
cross-stitch in sewing and embroidery, two stitches that cross to form an X. [1/3 definitions]
dental hygienist a licensed specialist in preventive dental care, whose practice includes cleaning and x-rays, and who often works in a dentist's office.
dosimeter a portable instrument that measures amounts of radiation, such as gamma rays or x-rays, to which a person has been exposed.
electromagnetic wave a wave that contains a magnetic and electric component and that is created by an accelerating electric charge, such as a radio wave, x-ray, or light.
encephalogram an x-ray photograph of the spaces of the brain normally filled with cerebrospinal fluid, partially replaced for the procedure by air or dye.
-es1 used to form the third person sing. present tense of verbs that end in "s," "z," "ch," "sh," "x," or "y" that changes to "i".
-es2 used to form the regular plural of nouns that end in "s," "x," "z," "ch," "sh," or "y" that changes to "i".
fluorescence the giving off of electromagnetic radiation, esp. in the form of visible light, during or after exposure to radiation from another source such as ultraviolet light or x-rays. [1/2 definitions]
fluoroscope a fluorescent screen used with x-rays or other radiation for viewing the internal structure of opaque objects such as the human body.
Klinefelter's syndrome a congenital disorder that causes sterility in males, caused by an extra X chromosome.
mammogram an x-ray picture of the breast, usu. made to check for cancerous growths.
mammography photography of the breast by x-ray, usu. for detection of cancerous growths.
multiplication sign a mathematical sign (x) indicating that the numbers before and after it are to be multiplied.