opaque medium

opaque medium

[ō′pāk ‚mēd·ē·əm]
(optics)
A medium impervious to rays of light, that is, not transparent to the human eye.
(physics)
A medium which does not transmit electromagnetic radiation of a specified type, such as that in the infrared, x-ray, ultraviolet, and microwave regions.
A medium which prevents the passage of particles of a specified type.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Both in the curtains and in the air they frame, Sugito is addressing the old challenge of rendering transparency with an opaque medium. The spiritual spaciousness connoted by these planes, it seems to me, is the paintings' strongest pull.
NICOLE KLAGSBRUN
I turned to gouache, an opaque medium, and set out to paint symbols.
Mystery of color, light
The addition of each opaque medium (11 [micro]L of medium to 1 mL of serum) to a control serum to reach the expected concentration after bolus injection for radiographic examination (7.5 g/L) led to the appearance of an abnormal peak in the CZE.
Interference of iodinated contrast media in serum capillary zone electrophoresis