- In electricity, coating of an electrode with a thick layer of hydrogen bubbles, with the result that the flow of current is weakened or arrested.
- A change effected in a ray of light passing through certain media, whereby the transverse vibrations occur in one plane only, instead of in all planes as in an ordinary light ray.
- Development of differences in potential between two points in living tissues, as between the inside and outside of a cell wall.
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Examples: glitazone, GI cocktail, etc.