An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 1043

Fr.: participer   

To take part, be or become actively involved.

From L. paticipatus p.p. of partcipare "to share," from particeps "partaking, sharing," from part-, pars "part," → partial, + capere "to take," → concept.

Pârgertidan, from pâr "part," → partial, + gertidan "to take," → concept.


Fr.: participation   

An act or instance of participating. The fact of taking part.

Verbal noun of → participate.


Fr.: participe   

A lexical form derived from a verb, that has some of the characteristics and functions of both verbs and adjectives. In most Indo-European languages participles are used to express participation in an action (present participle) or relate to a completed action (past participle). They can also appear in attributive form as adjectives.

M.E., from O.Fr. participle, variant of participe, from L. participium, literally "a sharing, partaking," from particeps "sharing, partaking," → participate.

Pârgerté, from pârgert present stem of pârgertidan, → participate, + nuance suffix .

  ذره، پارول   
1) , 2) zarré (#), 1), 2), 3) pârul

Fr.: particule   

1) A unit of → matter smaller than the → atom or its main components. The term particle also includes any (currently hypothetical) new particles that might be discovered, such as the supersymmetric partners of the → quarks and → leptons and → bosons.
2) Mechanics: A material body (a body possessing mass) the size of which can be neglected in investigating its motion.
3) Grammar: In some languages, a word that has a grammatical function but does not fit into the main parts of speech (i.e. → noun, → verb, → adverb, → preposition). For example, in English, off, on, out, and up in call off, pass on, rule out, and grow up, respectively.
See also:
alpha particle, → antiparticle, → astroparticle physics, → beta particle, → charged particle, → elementary particle, → energetic solar particle, → exchange particle, → Lagrangian particle, → nanoparticle, → particle horizon, → particle nature, → particle physics, → relativistic particle, → resonance particle, → sink particle, → Smoothed Particle Hydrodynamics, → strange particle, → subatomic particle, → test particle, → virtual particle, → wave-particle duality.

From L. particula "little bit or part," diminutive of pars (genitive partis), from PIE base *per- "to assign, allot;" cf. Mid.Pers. pârag "gift, offering, bribe;" Mod.Pers. pâreh "gift" (→ partial); Gk. porein "to provide, give, grant," peprotai "it has been granted;" Skt. purtá- "gift, pay, reward."

Zarré, from Ar. dharrat "particle." Pârul, from pâr, → part, + -ul, → -ule.

particle horizon
  افق ِ ذره   
ofoq-e zarré

Fr.: horizon des particules   

For an observer at a given epoch t0, the boundary between the observable and the unobservable regions of the → Universe. Therefore, the distance to the particle horizon at t0 defines the size of the → observable Universe. Same as → cosmic horizon.

particle; → horizon.

particle nature
  زاستار ِ ذره‌ای   
zâstâr-e zarre-yi

Fr.: nature de particule   

A general term to describe → light involving the following phenomena: → reflection, → refraction, and → photoelectric effect. Compare → wave nature.

particle; → nature.

particle physics
  فیزیک ِ ذره‌ای   
fizik-e zarreyi (#)

Fr.: physique des particules   

The branch of physics that deals with the smallest known structures of matter and energy in order to understand the fundamental particles and forces of nature.

particle; → physics.

  ۱) پارولی؛ ۲) پاروله   
1) pâruli; 2) pârulé

Fr.: particulier   

1) (adj.) Of or pertaining to a single or specific person, thing, group, class, occasion, etc., rather than to others or all; special rather than → general.
2a) (n.) An individual or distinct part, as an item of a list or enumeration.
2b) (n.) Logic: An individual or a specific group within a general class (

M.E., from O.Fr. particuler and directly from L.L. particularis "of a part, concerning a small part," from L. particula, → particle, + -ar, → -al.

Pâruli, adj. from pârul, → particle; pârulé, from pârul + nuance adj. .

particular astrolabe
  اسطرلاب ِ پارولی   
ostorlâb-e pâruli

Fr.: astrolabe particulier   

An → astrolabe that serves only a limited number of → latitudes.

particular; → astrolabe.

particular solution
  حل ِ پارولی   
hall-e pâruli

Fr.: solution particulière   

Of partial differential equations, the solution which can be obtained from the general solution by particular choice of the arbitrary functions. → general solution; → singular solution.

particular; → solution.

  پارولی، پارولمند   
pâruldâr, pârulmand

Fr.: particule en suspension   

1) Of or relating to minute separate → particles.
2) A particulate → substance.

From Mod. L. particulatus, from particula, → particle.

From pârul, → particle, + suffix or -mand.

particulate matter (PM)
  ماده‌ی ِ پارولی   
mâdde-ye pâruli

Fr.: particule en suspension   

Meteorology: A complex → mixture of → microscopic → particles and → liquid droplets suspended in the → atmosphere, especially pollutants.

particulate; → matter.

partition function
  کریای ِ پارش   
karyâ-ye pâreš

Fr.: fonction de partition   

In statistical mechanics, the function giving the probability that a particle belong to a population with a specified energy. It is the integral, over the phase space of a system, of the exponential of (-E/kT), where E is the energy of the system, k is Boltzmann's constant, and T is the temperature.

M.E., from from O.Fr., from L. partitionem (nominative partitio) "division, portion," from partitus, p.p. of partire "to part;" → function.

Karyâ, → function; pâreš, verbal noun from *pâridan, from pâr, pâré "piece, part, portion," parré "portion, segment (of an orange)," pargâlé, "piece, portion; patch;" (dialects Kermâni pariké "portion, half;" Tabari perik "minute quantity, particle;" Lârestâni pakva "patch;" Borujerdi parru "patch"); Mid.Pers. pârag "piece, part, portion; gift, offering, bribe;" Av. pāra- "debt," from par- "to remunerate, equalize; to condemn;" PIE *per- "to sell, hand over, distribute; to assigne;" Gk. peprotai "it has been granted;" L. pars, as above; Skt. purti- "reward;" Hitt. pars-, parsiya- "to break, crumble."

pârton (#)

Fr.: parton   

In particle physics, a constituent of the hadron originally postulated in the theoretical analysis of high-energy scattering of particles off hadrons. In modern usage, the term parton is often used to mean a quark or a gluon.

Coined by the American physicist Richard Feynman (1918-1988), from part, from → particle + → -ion

parts per million (ppm)
  پار در میلیون   
pâr dar milion

Fr.: partie par million   

A fraction of a whole number in units of 1/1000,000. It is usually used to describe chemical concentrations, very small amounts of pollutants in air, water, body fluids, and uncertainty. For example 30 ppm is 3 x 10-5 or 0.003%.

part; → per; → million.

pascal (Pa)
pâskâl (#)

Fr.: pascal   

The → SI unit of → pressure, that of one → newton per → square → meter. Since 1 Pa is a small pressure, hPa (→ hectopascals) are more widely used. 1 Pa = 10 dyn cm-2, = 1.02 x 10-5 kgf cm-2 = 10-5 bars = 9.87 x 10-6 atm = 7.50 x 10-3 torr (mm Hg).

In honor of Blaise Pascal (1623-1662), French mathematician, physicist, and religious philosopher for his contribution in the study of hydrodynamics and hydrostatics, in particular establishing the principle of the barometer.

Pascal's barrel experiment
  آزمایش ِ چلیک ِ پاسکال   
âzmâyeš-e celik-e Pascal

Fr.: expérience du tonneau de Pascal   

An experiment carried out by Blaise Pascal in 1646 to demonstrate the hydraulic pressure. A long and narrow vertical pipe was connected to the content of a closed wooden barrel already full of water. He poured a small quantity of water into the pipe, whereby the height of the fluid within the pipe sharply increased. Due to the increase in hydrostatic pressure and → Pascal's law, the barrel could leak and even burst.

pascal (Pa); M.E. barel, from M.Fr. baril, O.Fr. barril; → experiment

Pascal's law
  قانون ِ پاسکال   
qânun-e pâskâl (#)

Fr.: loi de Pascal   

A change in the pressure of an enclosed incompressible fluid is conveyed undiminished to every part of the fluid and to the surfaces of its container.

Named after Blaise Pascal (1623-1662), French mathematician, physicist, and religious philosopher for his contribution in the study of hydrodynamics and hydrostatics, in particular establishing the principle of the barometer.

Pascal's triangle
  سه‌بر ِ پاسکال   
sebar-e Pascal

Fr.: triangle de Pascal   

An array of numbers in the shape of a triangle, having a 1 at the top and also at the ends of each row. Each number is obtained by summing the two adjacent numbers to it in the preceding row. Each row is a set of → binomial coefficients. In the expansion of (x + y)n, the coefficients of x and y are given by the n-th row of Pascal's traingle.

pascal; → triangle.

Paschen series
  سری ِ پاشن   
seri-ye Paschen (#)

Fr.: série de Paschen   

The spectral series associated with the third energy level of the hydrogen atom. The series lies in the infrared, with Pα at 18,751 Å, and Paschen limit at 8204 Å.

In honor of Friedrich Paschen (1865-1947), German physicist; → series.

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