Fr.: naine dégénérée
Same as → white dwarf.
mâdde-ye vâgen (#)
Fr.: matière dégénérée
Highly compressed matter in which the normal atomic structure has broken down and which, because of quantum-mechanical effects, exerts a pressure that is independent of temperature. Bodies with masses less than → Chandrasekhar's limit (1.4 solar masses) are supported by electron → degeneracy pressure and have densities of about 106 kg/m3. In collapsed stars of mass above 1.4 solar masses, gravity will overwhelm electron degeneracy and further collapse ensues. Electrons combine with protons to form neutrons, so producing a → neutron star. Because neutrons, like electrons, are → fermions and therefore subject to the → Pauli exclusion principle, at high enough densities, about 1014 kg/m3, neutron degeneracy pressure prevents further collapse of the star. For masses larger than 2-3 solar masses, even neutron degeneracy cannot prevent further collapse, and a → black hole is formed.
1) To lower in dignity or estimation; bring into contempt.
1) Subdivision of an interval in a scale of measurement.
From O.Fr. degré, from V.L. *degradus "a step," from L.L. degredare, from L. → de- "down" + gradus "step."
Darajé, from Ar. darajat "step, ladder."
degree of freedom
daraje-ye âzâdi (#)
Fr.: degré de liberté
degree of ionization
daraje-ye yoneš (#)
Fr.: degré d'ionisation
The number of electrons a neutral atom has lost in an ionizing physical process (radiation, shock, collision). In spectroscopy, the degree of ionization is indicated by a Roman numeral following the symbol for the element. A neutral atom is indicated by the Roman numeral I, a singly ionized atom, one which has lost one electron, is indicated by II, and so on. Thus O VI indicates an oxygen atom which has lost five electrons.
degree of polarization
Fr.: degré de polarisation
The ratio of the intensity of polarized portion of light to the total intensity at a point in the beam.
degree of stability
Fr.: degré de stabilité
degree of vertex
Fr.: degré de vertex
The act or process or an instance of dehumanizing.
Verbal noun of → dehumanize.
To deprive of → human qualities or personality.
The smaller and outermost of Mars' two satellites. It measures 12.6 km in size, and orbits Mars every 30.2 hours at a distance of about 23,500 km. It was discovered by the American astronomer Asaph Hall in 1877.
In Gk. mythology, Deimos, meaning "fear, terror," is one of the sons of Ares (Mars) and Aphrodite (Venus).
Chemistry: A process in which all charged species are removed from
dâdâr-bâvari (#), izad-bâvari
1) Belief in the existence of a → God on the evidence of
→ reason and → nature only,
with rejection of supernatural revelation (distinguished from
dâdâr-bâvar (#), izad-bâvar
A person who believes in → deism.
1) izad (#); 2) izadgân
Fr.: 1) dieu, déesse; 2) divinité
1) A god or goddess.
M.E. deite, from O.Fr., from L.L. deitat- (nominative deitas), from L. dei- (combining form of deus "god") + -tat- "-ty," formed after L. divinitas "divinity."
Izad "god;" from Mid.Pers. yazêt "god; angel," izišn "performance of the religious rites, worship," yašt "worship, religious ceremony," yaštan "to venerate, to perform the religious ceremony;" O.Pers. yad- "to worship;" Av. yaz- "to sacrifice, worship, venerate," yazata- "deities," yasna- "religious rite" (Mod.Pers. jašn "feast"); Proto-Ir. *iaz- "to sacrifice, worship, venerate."
Fr.: opérateur del
In → vector calculus,
a vector → partial derivative represented by the symbol
→ nabla and defined in three dimensions to be:
From Gk. alphabet letter delta.
The amount of time by which an event is retarded.
From O.Fr. délaier, from dé-→ de- "away, from" + laiier, from laiss(i)er "to leave," from L. laxare "to loosen, release, set free."
Derang, from Mid.Pers. dirang, drang "delay, lateness; long, lasting," Av. drənj- "to fix, fasten, hold," Proto-Iranian *dra(n)j- "to fix, fasten, hold."
Fr.: temps de retard, délai
Same as → delay.
Fr.: neutrons retardés
Neutrons resulting from nuclear fission which are emitted with a measurable time delay. Delayed neutrons are responsible for the ability to control the rate at which power can rise in a reactor. → prompt neutrons.