An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 1259
  پیای، پی‌آی، پی‌آینده   
peyây, peyâyandé

Fr.: conséquent   

Logic: In a → conditional proposition, the → clause which follows then. See also → antecedent.


  پایش، پایندگی   
pâyeš, pâyandegi

Fr.: conservation, préservation   

The act or an instance of conserving.

Verbal noun of → conserve.

conservation law
  قانون ِ پایش، ~ پایندگی   
qânun-e pâyeš, ~ pâyandegi

Fr.: loi de conservation   

A general statement that a physical quantity, such as energy, momentum, mass, or charge is unchanged in an interaction occurring within a → closed system. See also → conservation of charge, → conservation of energy, → conservation of mass, → conservation of mass and energy, → conservation of matter, → conservation of momentum, → conservation of probability, → parity conservation, → conservative field.

conservation; → law.

conservation of charge
  پایش ِ بار   
pâyeš-e bâr

Fr.: conservation de charge   

In any given → frame of reference, → electric charge is neither created nor destroyed. This → law must not be confused with → charge invariance.

conservation; → charge.

conservation of energy
  پایش ِ کاروژ   
pâyeš-e kâruž

Fr.: conservation d'énergie   

The → principle whereby the → total energy of a → closed system remains → constant. This means that energy can neither be created nor destroyed. See also the → first law of thermodynamics.

conservation; → energy.

conservation of mass
  پایش ِ جرم   
pâyeš-e jerm

Fr.: conservation de masse   

A → principle of → classical physics whereby → matter can be neither created nor destroyed. Matter can, however, be → converted into → energy, as predicated by the theory of → special relativity. Also called → conservation of matter.

conservation; → mass.

conservation of mass and energy
  پایش ِ جرم و کاروژ   
pâyeš-e jerm o kâruž

Fr.: conservation de masse et d'énergie   

A principle, resulting from Einstein's theory of → special relativity whereby in any → closed system the sum of mass and energy remains → constant.

conservation; → mass; → energy.

conservation of matter
  پایش ِ ماده   
pâyeš-e mâddé

Fr.: conservation de matière   

Same as → conservation of mass.

conservation; → matter.

conservation of momentum
  پایش ِ جنباک   
pâyeš-e jonbâk

Fr.: conservation de quantité de mouvement   

A fundamental law of physics which states that the momentum of a → physical system does not change in the course of time if there are no external forces acting on the system. It is embodied in → Newton's first law. This principle shows that the interaction of bodies composing a → closed system leads only to an exchange in momentum between the bodies but does not affect the motion of the system as a whole. More specifically, interactions between the composing bodies do not change the velocity of the system's → center of mass.

conservation; → momentum.

conservation of probability
  پایش ِ شوانایی، پایندگی ِ ~   
pâyeš-e šavânâyi, pâyandegi-ye ~

Fr.: conservation de probabilité   

A principle according to which the sum of probabilities of all possible states that might come out of an initial state equals the probability of the initial state.

conservation; → probability.

  پایش‌گرایی، پایش‌باوری   
pâyešgerâyi, pâyešbâvari

Fr.: conservatisme   

The disposition, or political philosophy, to preserve the existing or traditional order and oppose radical change.

conservative; → -ism.


Fr.: conservateur   

1) Physics: Of or pertaining to a law of → conservation.
2) Opposed to change and innovation and disposed to keep existing values.
3) Of or relating to a philosophy of → conservatism.
4) An adherent or advocate of political conservatism.

M.Fr. conservatif, from L.L. conservativus, from L. conservatus, p.p. of conservare, → conserve.

Pâyešmand, from pâyeš, → conservation, + -mand possession suffix, → -ist.

conservative field
  میدان ِ پایش‌مند   
meydân-e pâyešmand

Fr.: champ conservatif   

A → field of → force in which the → work done in taking a particle from one point to another is independent of the → path taken between them. Examples are → electrostatic field and → gravitational field.

conservative; → field.

conservative system
  راژمان ِ پایش‌مند   
râžmân-e pâyešmand

Fr.: système conservatif   

A system in which there is no dissipation of energy so that the total energy remains unchanged with time.



Fr.: conservatisme   

The condition or quality of being → conservative.

conservative; → -ness.


Fr.: conserver   

1) General: To keep or protect from harm, decay, or destruction.
2) Physics, chemistry: To maintain a quantity constant during an interaction or process of evolutionary change. → conservation law.

M.E., from O.Fr. conserver, from L. conservare "to keep, preserve, guard," from → com- + servare "keep, watch, maintain," → observe.

Pâyidan "to watch, observe, look steadily," variants pâsidan, pâhidan; Mid.Pers. pây- "to protect, guard;" Sogdian p'y "to observe, protect, watch over;" O.Pers. pā- "to protect," pāta- "protected;" Av. pā- "to protect," pāti "guards," nipā(y)- (with ni-) "to watch, observe, guard," nipātar- "protector, watcher," nipāθri- "protectress;" cf. Skt. pā- "to protect, keep," tanû.pā- "protecting the body," paś.pā- "shepherd;" Gk. poma "lid, cover," poimen "shepherd;" L. pascere "to put out to graze," pastor "shepherd;" Lith. piemuo "shepherd;" PIE base *pā- "to protect, feed."

conserved quantity
  چندی ِ پاینده   
candi-ye pâyandé

Fr.: quantité conservée   

A quantity that remains constant when its corresponding physical system undergoes a transformation.



Fr.: considérer   

To think carefully about, especially in order to make a decision; contemplate; reflect on (

M.E. consideren, from O.Fr. considerer "reflect on, study," from L. considerare "to examine, look at closely," literally "to observe the stars," from → com- "with" + sider (stem of sidus) "star, group of stars," → sideral.

Âgâridan, from intensive prefix â- + gâr-, variants gar-, gâl- "to consider, observe," as in engâridan "to suppose," negaristan "to observe, look, notice," segâl "thought," segâlidan "to think, meditate," ultimately from Proto-Iranian *kar- "to observe, to consider;" cf. Av. kar- "to remember; to impress on memory;" Skt. kal- "to observe, consider," kalayati "considers, observes."


Fr.: considérable   

1) Rather large or great in size, distance, extent, etc.
2) Worthy of respect, attention, etc.; important; distinguished (

consider; → -able.


Fr.: considération   

The act or an instance of considering.

consider; → -tion.

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