- 1. The act of dispersing or of being dispersed. SYN: dispersal. 2. Incorporation of the particles of one substance into the mass of another, including solutions, suspensions, and colloidal dispersions (solutions). 3. Specifically, what is usually called a colloidal solution. 4. The extent or degree in which values of a statistical frequency distribution are scattered about a mean or median value. [L. dispersio]- coarse d. SYN: suspension (4).- molecular d. d. in which the dispersed phase consists of individual molecules; if the molecules are of less than colloidal size, the result is a true solution.- optic rotatory d. (ORD) the change in optic rotation with the wavelength of the incident monochromatic polarized light; the displacement of the former from zero within the absorption band is known as the Cotton effect.- temporal d. asynchronous repolarization of myocardial fibers that predisposes to abnormal current flow and ectopic rhythms (especially with bradyarrhythmias or ventricular tachyarrhythmias).
* * *dis·per·sion dis-'pər-zhən, -shən n1) the act or process of dispersing: the state of being dispersed2) the separation of light into colors by refraction or diffraction with formation of a spectrum also the separation of radiation into components in accordance with some varying characteristic (as energy)3 a) a dispersed substanceb) a system consisting of a dispersed substance and the medium in which it is dispersed: COLLOID (2b) called also disperse system
* * *dis·per·sion (dis-purґzhən) [L. dispersio] 1. the act of scattering or separating; the condition of being scattered. 2. the incorporation of the particles of one substance into the body of another, comprising solutions, suspensions, and colloid systems. a 3. colloid system, particularly an unstable one.
Medical dictionary. 2011.