1) To spread or distribute from a fixed or constant source.
M.E., from M.Fr. disperser "scatter," from L. dispersus, p.p. of dispergere "to scatter," from → dis- "apart" + spargere "to scatter," from PIE base *(s)pregh- "to scatter;" cf. Av. spareg- "to germinate, shoot, sprout," fra-sparəγa- "shoot, sprout," Skt. parjanya- "rain, rain god," Lith. spurgas "sprout."
Pâšidan "to scatter, sprinkle," az ham pâšidan "to scatter on all sides;" cf. Gazi pâšn-/pâšnâ "to scatter, spread," Lor. perxa "sprinkling;" Av. paršat.gauu- "having a speckled cow;" Skt. prs- "to sprinkle," parsati "sprinkles;" Toch. pärs- "to sprinkle;" Lith. purškiu "I spray;" PIE roor *pers- "to spray, sprinkle."
1) The resolution of white light into its component wavelengths,
either by → refraction or by → diffraction.
Dispersion is actually an effect in which radiations having → different
wavelengths travel at different speeds in the medium. Since
the → angle of refraction
of each radiation vary as a function of
its → wavelength, the component waves deviate from each other.
Verbal noun of → disperse.
Fr.: courbe de dispersion
A graph displaying the variation of the → refractive index of a substance against the wavelength of the electromagnetic wave passing through the substance.
Fr.: équation de dispersion
Fr.: mesure de dispersion
A parameter used in radio astronomy which describes the amount of dispersion in a radio signal due to its passage through an intervening plasma. It is proportional to the product of the interstellar electron density and the distance to the source.
Fr.: relation de dispersion
An equation that describes how the → angular frequency, ω, of a wave depends on its → wave number, k. For the simplest of waves, where the speed of propagation, c, is a constant, ω(k) = ck. If the → phase velocity depends on k, that is for a dispersive medium, the function ω(k) is nonlinear.
Tending or serving to disperse.
Fr.: indice de dispersion
The reciprocal of the → dispersive power.
Fr.: milieu dispersif
Fr.: pouvoir dispersif
A measure of the ability of a medium to separate different colors of light. It is defined by: (n2 - n1)/(n - 1), where n1 and n2 are refractive indices at two specified widely differing wavelengths, and n is the → index of refraction for the average of these wavelengths.
A vector quantity that specifies the change of position of a body or
particle from the mean position or position of rest.
From displace, from → dis- + place + -ment.
Jâ bé jâyi, noun of jâ bé jâ literally "place to place," from jâ "place," from Mid.Pers. giyag "place," O.Pers. ā-vahana- "place, village," Av. vah- "to dwell, stay," vanhaiti "he dwells, stays," Skt. vásati "he dwells," Gk. aesa (nukta) "to pass (the night)," Ossetic wat "room; bed; place," Tokharian B wäs- "to stay, wait;" PIE base ues- "to stay, live, spend the night."
jarayân-e jâ-be-jâyi (#)
Fr.: courant de déplacement
In electromagnetism, a quantity which is not a real current (movement of charge), but has the units of current and has an associated magnetic field. The physical meaning of this displacement current is that a changing electric field makes a changing magnetic field.
1) nemudan, nemâyândan, nemâyeš dâdan; 2) nemâyeš (#)
Fr.: 1) visualiser; 2) visualisation
1a) To show; make visible.
From O.Fr. despleier "to unfold, spread out," from L. displicare "to scatter," from → dis- "un-, apart" + plicare "to fold, twist," from PIE base *plek- "to plait, twist" (cf. Gk. plekein "to plait," L. plectere "to plait, braid, intertwine," Av. frašna- "helmet" (in ərəzatô.frašna- "having a silver helmet" (epithet of Mithra), Skt. praśna- "turban," O.H.G. flehtan "to plait," Russ. plesti "to plait").
Nemudan, nemâyândan "to show, display," from Mid.Pers. nimūdan, present stem nimây- "to show," from O.Pers./Av. ni- "down; into," → ni-, + māy- "to measure," cf. Skt. mati "measures," matra- "measure," PIE base *me- "to measure;" cf. Gk. metron "measure," L. metrum.
1) To incur the dissatisfaction, dislike, or disapproval of; offend; annoy.
Fr.: mécontentement, déplaisir
Dissatisfaction, disapproval, or annoyance.
Forcible division into pieces of an object. → tidal disruption.
From L. disruptio "a breaking asunder," noun of action from p.p. stem of disrumpere "break apart, split, shatter, break to pieces," from → dis- "apart" + rumpere "to break."
Gosixt, past stem of gosixtan "to tear away, to beark off."
1) To cut apart (an animal body, plant, etc.) to examine the structure, relation of
parts, or the like.
The act of dissecting.
From L. dissipatus, p.p. of dissipare "to disperse, squander," from → dis- "apart" + supare "to throw, scatter."
Eftâl, eftâleš, from eftâlidan "to disperse; to tear; to break," ultimately from Proto-Ir. *abi-tard-, from *tard- "to pierce, split;" cf. Skt. tard- "to split, pierce, open;" Lith. trandéti "to be eaten by moths or worms;" PIE base *terd- "to pierce" (Cheung 2007).
The loss of energy over time by a → dynamical system, typically due to the action of → friction or → turbulence. The lost energy is converted into heat, raising the temperature of the system. See also: → Ohmic dissipation. → viscous dissipation.
Noun form of → dissipate.