An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1381
spatial coherence
  همدوسی ِ فضایی   
hamdusi-ye fazâyi

Fr.: cohérence spatiale   

In a wave train, a correlation between the phases of waves at points separated in space at a given time.

spatial; → coherence.

spatial resolution
  واگشود ِ فضایی   
vâgošud-e fazâyi

Fr.: résolution spatiale   

The smallest detail that can be seen in an image. Same as → angular resolution.

spatial; → resolution.

speak
  سخنیدن   
soxanidan (#), soxan goften (#)

Fr.: parler   

To utter words with the ordinary voice (not singing) to communicate; to talk.

From M.E. speken "to speak," from O.E. specan, alteration of earlier sprecan "to speak;" cf. Low Germ. spreken "to speak," Du. spreken, Ger. sprechen "to speak;" ultimately from PIE *spreg- "to make a sound, utter, speak."

From M.P. saxwanitan "to speak, to talk," → speech.

special
  ویژه   
vižé (#)

Fr.: spécial, particulier   

Of a distinct or particular kind or character; having a particular function or purpose; not common, usual, or general.

M.E., from O.Fr. especial, from L. specialis "individual, particular," from → species "appearance, kind, sort."

Vižé, from Mid.Pers. apēcak "pure, sacred," from *apa-vēcak "set apart," from prefix apa- + vēcak, from vēxtan (Mod.Pers. bixtan) "to detach, separate, sift, remove," Av. vaēk- "to select, sort out, sift," pr. vaēca-, Skt. vic-, vinakti "to sift, winnow, separate; to inquire."

special relativistic
  بازانیگی‌مند ِ ویژه   
bâzânigimand-e vižé

Fr.: de relativité restreinte   

Of, relating to, or subject to the theory of → special relativity.

special; → relativistic.

special relativity
  بازانیگی ِ ویژه   
bâzanigi-ye vižé

Fr.: relativité restreinte   

The theory formulated by A. Einstein in 1905, which is based on the following two → postulates:
1) → Principle of relativity: The laws of physical phenomena are the same when studied in terms of two reference systems moving at a constant velocity relative to each other.
2) → Principle of constancy: The → velocity of light in free space is the same for all observers and is independent of the relative velocity of the source of light and the observer.
The term "special theory of relativity" refers to the restriction in the first postulate to reference systems moving at a constant velocity relative to each other (→ inertial reference frame). See also → general relativity.

special; → relativity.

species
  آرز   
âraz

Fr.: espèce   

1) A class of individuals having some common characteristics or qualities; distinct sort or kind.
2) Biology: The major subdivision of a genus or subgenus, regarded as the basic category of biological classification, composed of related individuals that resemble one another, are able to breed among themselves, but are not able to breed with members of another species.
3) Logic: One of the classes of things included with other classes in a genus. The set of things within one of these classes (Dictionary.com).

From L. species "a particular sort, kind, or type," originally "a sight, look, view, appearance," from specere "to look at, to see, behold;" PIE root spek- "to look around," → scope.

Âraz, from intensive/nuance â- + raz-, from Av. razan "order, → rule," from rāz- "to put in line, direct set," cf. Mod.Pers. raj "line, row," variants raž, rak, râk, rezg (Lori), radé, râdé "line, rule, row," rasté, râsté "row, a market with regular ranges of shops;" ris, risé "straight;" → right.

specific
  آبیزه   
âbizé

Fr.: précis, explicite, spécifique   

1) Clearly defined or identified; precise; particular.
2) Belonging or relating uniquely to a particular subject; not general.
3) Biology: Relating to species or a species.
4) Physics: Of or denoting a physical quantity expressed in terms of a unit mass, volume, or other measure, in order to give a value independent of the properties or scale of the particular system studied. → specific angular momentum; → specific charge; → specific density; → specific gravity; → specific heat; → specific humidity; → specific intensity; → specific volume.

From Fr. spécifique and directly from L.L. specificus "constituting a kind or sort," from L. species "kind, sort," → species.

Âbizé, from Mid.Pers. apēcak "pure, sacred" (older form of vižé, → special), from *apa-vēcak "set apart," from prefix apa- + vēcak, from vēxtan (Mod.Pers. bixtan) "to detach, separate, sift, remove," Av. vaēk- "to select, sort out, sift," pr. vaēca-, Skt. vic-, vinakti "to sift, winnow, separate; to inquire."

specific angular momentum
  جنباک ِ زاویه‌ای ِ آبیزه   
jonbâk-e zâvie-yi-ye âbizé

Fr.: moment angulaire spécifique   

Angular momentum per unit mass.

specific; → angular; → momentum.

specific charge
  بار ِ آبیزه   
bâr-e âbizé

Fr.: charge spécifique   

The electric charge to mass ratio of an elementary particle.

specific; → charge.

specific density
  چگالی ِ آبیزه   
cagâli-ye âbizé

Fr.: densité spécifique   

Same as → relative density.

specific; → density.

specific gravity
  گرانی ِ آبیزه   
gerâni-ye âbizé

Fr.: gravité spécifique   

The ratio of the density of a substance at the temperature under consideration to the density of water at the temperature of its maximum density (4 °C).

specific; → gravity.

specific heat
  گرمای ِ آبیزه   
garmâ-ye âbizé

Fr.: chaleur spécifique   

1) The quantity of heat required to raise the temperature of 1 gm of a substance through 1 °C. More generally, the → heat capacity of a unit mass of a substance. For a homogeneous body it is expressed as: C = dQ/M dT, where dQ is the quantity of heat transferred to a mass of M to raise the temperature by dT. It is often convenient to use the gram-mole as a unit of mass, → molar heat capacity.
2) For a gas there are two principal specific heats depending on the way in which the temperature is increased: i) that measured at constant pressure, CP, and ii) that measured at constant volume, CV. The specific heat CP is greater than CV, because a gas heated at constant pressure expands, and heat energy must be supplied equivalent to the work done in the expansion. The ratio γ = CP/CV is called the → adiabatic index. It varies from 1.66 for mono-atomic gases to a little over 1 for gases with complex molecules.

specific; → heat.

specific humidity
  نم ِ آبیزه   
nam-e âbizé

Fr.: humidité spécifique   

The dimensionless ratio of the mass of water vapor to the total mass in a particular volume. → humidity

specific; → humidity.

specific intensity
  درتنویی ِ آبیزه   
dartanuyi-e âbizé

Fr.: intensité spécifique   

A measure of the amount of radiation received per unit solid angle per unit time per unit area normally from an element of surface.

specific; → intensity.

specific star formation rate (sSFR)
  نرخ ِ آبیزه‌ی ِ دیسش ِ ستارگان   
nerx-e âbize-ye diseš-e setâregân

Fr.: taux de formation d'étoiles spécifique   

Star formation rate per unit → mass. More specifically, the → star formation rate in a galaxy divided by the → stellar mass of the galaxy. Observations of galaxies over a wide range of → redshifts suggest that the slope of the SFR-M* relation is about unity, which implies that their sSFR does not depend strongly on stellar mass. Specific star formation rates increase out to z ~ 2 and are constant, or perhaps slowly increasing, from z = 2 out to z = 6, though with a large scatter, sSFR ~ 2-10 Gyr-1 (Lehnert et al., 2015, A&A 577, A112, and references therein).

specific; → star; → formation; → rate.

specific volume
  گنج ِ آبیزه   
gonj-e âbizé

Fr.: volume spécifique   

The volume occupied by unit mass of a substance. Specific volume is the reciprocal of density.

specific; → volume.

specification
  آبیزش   
âbizeš

Fr.: précision, spécification   

1) The act of specifying.
2) A particular item, aspect, calculation, etc., in such a description.
3) Something specified, as in a bill of particulars; a specified particular, item, or article (Dictionary.com).

Verbal noun of → specify.

specifity
  آبیزگی   
âbizegi

Fr.: spécifité   

The state or character of being → specific.

specific; → -ity.

specify
  ۱) پرسونیدن؛ ۲) آبیزیدن   
1) parsunidan; 2) âbizidan

Fr.: préciser, spécifier   

1) To mention or name specifically or definitely; state in detail.
2) To give a specific character to; to set forth as a specification (Dictionary.com).

specific; → -fy.

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