An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 602
  درهاختن، درهازیدن   
darhâxtan, darhâzidan

Fr.: induire   

To cause or initiate by influence or some means; e.g. → induced current; → induced emission.

Induce, "to lead by persuasions or other influences," from L. inducere "to lead into, persuade," from → in- "in" + ducere "to lead," from PIE *deuk- "to lead" (cf. O.E. togian "to pull, drag," O.H.G. ziohan "to pull").

Darhâxtan, darhâzidan, from dar- "in" + Mid.Pers. hâxtan, hâzidan, "to lead, guide, persuade;" Av. hak-, hacaiti "to attach oneself to, to join;" cf. Skt. sacate "accompanies, follows;" Gk. hepesthai "to follow,"; L. sequi "to follow;" PIE *sekw- "to follow."

  درهازیده، درهاخته   
darhâzidé, darhâxté

Fr.: induit   

Brought about or caused by → induction.

Induced, p.p. of → induce.

induced current
  جریان ِ درهازیده، ~ ِ درهاخته   
jarayân-e darhâzidé, ~ darhâxté

Fr.: courant induit   

Current resulting from the relative motion of a conductor through a magnetic field.

induced ; → current.

induced electric field
  میدان ِ برقی ِ درهازیده، ~ ِ ~ ِ درهاخته   
meydân-e barqi-ye darhâzidé, ~ ~ darhâxté

Fr.: champ électric induit   

An electric field created by the variation of a magnetic field. The induced electric field lines are usually perpendicular to the changing magnetic field that produces them.

induced; → electric; → field.

induced emission
  گسیل ِ درهاخته، ~ ِ درهازیده   
gosil-e darhâxté, ~ darhâzidé

Fr.: émission induite   

The emission of radiation from an atom when it is bombarded by photons. The induced radiation has the same wavelength and direction as the bombarding radiation. Same as → stimulated emission.

induced; → emission.

induced fission
  شکافت ِ درهازیده، ~ درهاخته   
šekâft-e darhâzidé, ~ darhâxté

Fr.: fission induite   

Fission which takes place when a nucleon is bombarded with neutrons or high-energy radiation (gamma rays).

Induced, p.p. of → induce; → fission.


Fr.: inductance   

The property of an electric circuit, or of two neighboring circuits, by virtue of which an electromotive force is induced in one circuit by a change of current in either of them.

Inductance, from induct, from L. inductus, p.p. of → induce + → -ance.


Fr.: induction   

1) General: The act of inducing, bringing about, or causing.
2) Electromagnetism: A common term for the process by which a body having electric or magnetic properties produces magnetism, an electric charge, or an → electromotive force in a neighboring body without contact. For more details, see → electromagnetic induction; → electrostatic induction; → magnetic induction.
3) Math.: A method of mathematical proof typically used to establish that a given statement is true of all natural numbers. It is done by proving that the first statement in the infinite sequence of statements is true, and then proving that if any one statement in the infinite sequence of statements is true, then so is the next one.
4) Logic: Any form of reasoning in which the conclusion, though supported by the premises, does not follow from them necessarily. → inductive reasoning.

Verbal noun of → induce.

induction coil
  پیچه‌ی ِ درهازش   
pice-ye darhâzeš

Fr.: bobine d'induction   

A device for producing high-voltage pulses by means of → electromagnetic induction. It consists of a primary coil of a few turns of wire, wound on an iron core, and insulated from a secondary coil of many turns which surrounds it coaxially. The current in the primary, which is interrupted periodically, sets up a magnetic field, first big, then zero. This changing field induces a large voltage in the secondary.

induction; → coil.

induction equation
  هموگش ِ درهازش   
hamugeš-e darhâzeš

Fr.: équation d'induction   

In magnetohydrodynamics, an equation that describes the transport of plasma and magnetic field lines over time:
B/∂t = ∇ x (v x B) + η∇2B,
where B is the → magnetic induction, v is the plasma velocity, and η = (μσ)-1 the → magnetic diffusivity. The first term on the right side represents → magnetic advection and the second term → magnetic diffusion. The induction equation can also be expressed as:
B/∂t = -(v.∇)B + (B.∇)v - B(∇.v),
where the terms of the right-hand side stand for advection, stretching, and compression, respectively. Among these terms, net increase of the field can be done only through the stretching and compression.

induction; → equation.

induction field
  میدان ِ درهازش   
meydân-e darhâzeš

Fr.: champ d'induction   

A component of an electromagnetic field which is the region close to the source (an antenna) where steady-state magnetic and electrostatic forces can be detected. → radiation field.

induction; → field.


Fr.: inductif   

Of, relating to, or using → induction. induction

From induct, → induce, + → -ive.

inductive reasoning
  راینش ِ درهازشی   
râyaneš-e darhâzeši

Fr.: induction, raisonnement inductif   

Reasoning from detailed facts to general principles.

deductive; → reasoning.

  درهازگر، درهازنده   
darhâzgar, darhâzandé

Fr.: bobine d'induction   

A coil of wire used to introduce inductance into an electric circuit.

Agent noun of → induce.

  سرخپوست، هندی   
Sorxpust (#), Hendi (#)

Fr.: Indien   

The American Indian. A faint, southern constellation (right ascension: 21 hours, declination: -55 degrees), supposed to represent an American native Indian. It was introduced in the 1603 star atlas of Johann Bayer and contains no stars brighter than the third magnitude. Abbreviation: Ind; genitive: Indi.

Indus "an Indian," from L., from Gk. Indos "the Indus River, an Indian."

Sorxpust "red skin," the term coming from the reddish skin color of some native Americans, from sorx, → red, + pust "skin," from Mid.Pers. pôst "skin;" Av. pastô-, in pastô.fraθanhəm "of the breadth of the skin."
Hendi "Indian," Mid.Pers. Hindûk, from Hind "Indian;" O.Pers. hindu- "Sind, a province of the Persian Empire on the upper Indus River," Hinduya- "man of Sind;" Av. hindu-, həndu-; Skt. sindhu- "stream; the Indus; country around the Indus."

inelastic collision
  هم‌کوبش ِ ناکشایند   
hamkubeš-e nâkešâyand

Fr.: collision inélastique   

A collision between bodies in which there is a loss of total kinetic energy.

inelastic; → collision.

inelastic scattering
  پراکنش ِ ناکشایند   
parâkaneš-e nâkešâyand

Fr.: diffusion inélastique   

A type of scattering when the → scattered radiation has a → wavelength different from that of the → incident radiation (→ Raman scattering, → fluorescence ).

inelastic; → scattering.

  ناهموگی، نابرابری   
nâhamugi, nâbarâbari

Fr.: inégalité   

1) A statement of the form a ≠ b, a > b, or a < b, asserting one quantity is greater than or less than another quantity. → equality.
2) An irregularity in the movement of a celestial object in its orbit about another which cannot be explained by their mutual gravitational attraction. Irregularities are often due to perturbation by other neighboring objects.

in-; → equality.

laxt (#)

Fr.: inerte   

Having no inherent power of action, motion, or resistance (opposed to active).
Chemistry: A chemically inactive element, compound or material. → inert gas.

Inert, from Fr. inerte, from L. inertem "unskilled, inactive," from → in- "without" + ars (gen. artis) "skill."

Laxt "sluggish, inert."

inert gas
  گاز ِ لَخت   
gâz-e laxt

Fr.: gaz rare, ~ inerte   

Any one of six gases helium, neon, argon, krypton, xenon, and radon, all of whose atomic shells contain complete numbers of electrons so that the atoms are almost completely chemically inactive. Same as noble gases.

inert; → gas.

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