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: 1298
significant
  نشانار   
nešânâr

Fr.: significatif   

1) Having a special or suggestive → meaning.
2) Statistics: Of or pertaining to a result that is not plausible to occur by chance.

From L. significant-, stem of significans, from significare, "to → signify."

Nešânâr, from nešân, → sign, + âr short form of âvar present stem of âvardan "to bring, adduce, cause, produce."

significant digit
  رقم ِ نشانار   
raqam-e nešânâr

Fr.: chiffre significatif   

The number of digits used to express a measured or calculated quantity. Rules for deciding the number of significant digits:
The leftmost digit which is not a zero is the most significant digit.
If the number does not have a decimal point, the rightmost digit which is not a zero is the least significant digit.
If the number does have a decimal point, the rightmost significant digit is the least significant digit, even if it's a zero.
Every digit between the least and most significant digits should be counted as a significant digit.

significant; → digit.

signification
  نشانارش   
nešânâreš

Fr.: signification   

1) Something that is signified, → meaning, sense.
2) The act of signifying. → significance, → significant, → level of significance.

Verbal noun of → signify.

signify
  نشاناردن   
nešânârdan

Fr.: signifier   

To make known; to be a sign of; to → mean. → significance, → significant, → signification.

M.E. signifien, from O.Fr. signifier, from L. significare "to make a sign, indicate, mention, denote."

Nešânâridan, from nešânâr, → significant, + -dan suffix of infinitives.

silence
  بیدنگی   
bidengi (#)

Fr.: silence   

1) Absence of sound or noise.
2) The state or fact of being silent.

Noun from → silent.

silent
  بیدنگ   
bideng (#)

Fr.: silencieux   

1) Making no sound; quiet; still.
2) Refraining from speech.

From L. silentem (nominative silens) "still, calm, quiet," p.p. of silere "to be quiet or still," of unknown origin.

Bideng, from Kurd. (Kurmanji) bêdeng, bêdêng, Kurd. (Sorani) bedang, from bi- "without," → a-, + deng "sound, voice," variants dong, dang, bâng, → Big Bang.

silex
  سیلکس، آتشزنه، چخماق   
sileks (#), âtašzané (#), caxmâq (#)

Fr.: silex   

A type of heat-resistant glass, especially in the form of flint or → quartz.

L. silex "hard stone, flint." Âtašzané "that used for kindling, ignitor," from âtaš, → fire, + zadan "to strike," → beat + instrument suffix. Caxmâq loan from Turkish.

silhouette disk
  گرده‌ی ِ سیه‌رخ، دیسک ِ ~   
gerde-ye siyah-rox, disk-e ~

Fr.: disque silhouette   

A dark disk seen in absorption against the bright nebular background. → proplyd.

From Fr. silhouette, in allusion to Étienne de Silhouette (1709-67), Fr. controller general of finances in 1759; perhaps from his ephemeral tenure; → disk.

Gerdé, → disk; siyah-rox, from siyah, → black, + rox, variant of ru(y) "face, surface; aspect; appearance," (Mid.Pers. rôy, rôdh "face;" Av. raoδa- "growth," in plural form "appearance," from raod- "to grow, sprout, shoot;" cf. Skt. róha- "rising, height").

silica
  سیلیس   
silis (#)

Fr.: silice   

A widely found mineral of silicon dioxide SiO2, which is used as an ore of → silicon. It is a hard, white, or colorless crystalline compound with a high melting point, occurring abundantly as quartz, sand, flint, rock crystal, etc.

From L. silic- stem of → silex "hard stone, flint, boulder."

silicate
  سیلیکات   
silikât (#)

Fr.: silicate   

A common rock-forming → mineral belonging to a group formed from → silicon and → oxygen combined with various elements and classified by their crystalline structures. SiO4 in the shape of a tetrahedron is the main component of the group. It has been estimated that about 95% of the Earth's crust is made up of silicate minerals. A salt of → silicic acid.

From → silica + → -ate.

silicic
  سیلیسیک   
silisik (#)

Fr.: silicique   

1) Containing → silicon.
2) Of or pertaining to → silica or acids derived from it.

From silic-, from → silic + → -ic.

silicic acid
  اسید سیلیسیک   
asid silisik (#)

Fr.: acide silicique   

A general name for a family of chemical compounds containing the element silicon attached to oxide and hydroxyl groups.

silicic; → acid.

silicon
  سیلیسیوم   
silisiom (#)

Fr.: silicium   

A non-metallic chemical element; symbol Si. Atomic number 14; atomic weight 28.0855; melting point 1,410°C; boiling point 2,355°C; specific gravity 2.33 at 25°C. It occurs in a combined state in minerals and rocks and constituting more than one fourth of the earth's crust.

From silic(a), from L. silex (genitive silicis) "flint, pebble" + -on, as in carbon and boron.

Silisiom, from Fr. silicium, from silic(a), as above, + -ium as in magnesium, barium.

silicon burning
  سوزش ِ سیلیسیوم   
suzeš-e silisiom

Fr.: combustion du silicium   

The → nucleosynthetic process taking place in the interior of → massive stars whereby → silicon is transmuted into iron, nickel, and neighboring nuclei collectively called the → iron peak elements.

silicon; → burning.

silk
  ابریشم   
abrišam (#)

Fr.: soie   

The soft, lustrous fiber obtained as a filament from the cocoon of the silkworm (Dictionary.com).

M.E., from O.E. seolc, sioluc, from L. sericum "silk garment, silk," from neuter of sericus "silken," from Gk. serikos, from Seres, an eastern Asian people, probably the Chinese (cf. Chinese si "silk", Manchurian sirghe, Mongolian sirkek).

Abrišam "silk," from Mid.Pers. abrešom "silk," ultimately from Proto-Ir. *au-uris-, from *uris- "to turn, spin;" cf. rešté "thread, line, file," reštan, ristan, "to spin;" Mid.Pers. 'rws- "to turn to;" Av. uruuaēs- "to twist, turn."

Silk damping
  میرایی ِ سیلک   
mirâyi-ye Silk

Fr.: amortissement de Silk   

The smoothing of primordial → density fluctuations at high frequencies caused by photon → diffusion. Before the → decoupling era, photons and → baryons were tightly coupled to each other by → Compton scattering. However, the transition to a transparent → Universe was not instantaneous. As the → opacity of the Universe dropped, the photons started diffusing away from the positions they had while opaque, hence undergoing a → random walk. Since the → acoustic waves in the decoupling era were driven by photon pressure, the photon diffusion also led to damping of the → baryon acoustic oscillations. Silk damping suppresses all perturbations with masses smaller than about 1013 Msun. The implication for a theory of → structure formation is that individual galaxies must have formed in a → top-down structure formation mechanism, i.e. by the fragmentation of larger objects. However, in theories of structure formation which include → non-baryonic dark matter galaxies can form from smaller objects in a → bottom-up scenario.

Joseph Silk (1942-); → damping.

silver
  نقره   
noqré (#)

Fr.: argent   

A metallic → chemical element; symbol Ag (L. argentum). → Atomic number 47; → atomic weight 107.8682; → melting point 961.93°C; → boiling point 2,212°C; → specific gravity 10.5 at 20°C. Pure silver is nearly white, lustrous, soft, very ductile, malleable, and an excellent conductor of heat and electricity.
Silver is generated in stars through a special rapid process of → neutron captures. This process defers from the main → r-process, the main and weak → s-process, and charged particle freeze-outs. In other words, during a → supernova explosion, silver is formed in a different → fusion process from the one that forms → gold (Hansen et al., 2012, A&A 545, A31).

M.E. silver(e), selver(e), selfer; O.E. seolfor "silver;" cf. O.S. silvbar, O.N. silfr, M.Du. silver, Du. zilver, O.H.G. sillabar, Ger. silber, Goth. silubr, akin to Serbo-Croatian srebro, Rus. serebo, Lith. sidabras "silver."
L. argentum "silver, white money," from PIE *arg-ent-, from PIE *arg- "to be bright, shine;" cf. Av. ərəzata- "silver," auruša- "white" (Mid.Pers. arus "white, bright"); O.Pers. ardata- "silver;" Mod.Pers. arziz "silvery metal tin;" Skt. arjuna- "white, shining," rajata- "silver;" Gk. argos "white," arguron "silver;" Arm. arcat; Hittite harki- "white."

Noqré from Sogdian nâkartak "uncoined (silver)," literally "undone," from nâ- negation prefix "not, no" (Mid.Pers. ne, O.Pers. naiy, Av. na-, (particle of negation noit), Skt. na-, (ned), Gk. né- "not," L. ne-, in-, un-, PIE *ne-) + kartak "done," p.p. of kardan "to do, to make;" kâr "work," variant kar (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base kwer- "to do, to make"), Sogdian nâktênê "of silver." Note that another word in Pers. for silver is sim, which has a semantic form comparable to that of noqré, since it derives from Mid.Pers. asêm, from Gk. asemon "without mark, uncoined, shapeless, formless," from argurion asemon "uncoined money."

SIMBAD
     
SIMBAD

Fr.: SIMBAD   

A large on-line astronomical database, developed at the Centre de Données astronomiques de Strasbourg, → CDS in France. It provides a large collection of astronomical data, including cross-identifications, bibliography, and measurements for astronomical objects outside the solar system.

SIMBAD, short for Set of Identifications, Measurements, and Bibliography for Astronomical Data.

similar
  همانند   
hamânand (#)

Fr.: similaire   

1) Geometry: Having the same shape; representing the same figure drawn to different scales (same corresponding angles and proportional sides).
2) Math.: Related by means of a → similarity transformation.

From Fr. similaire, from L. similis "like," → simulate.

Hamânand, contraction of hammânand, from ham-, → com-, + mânand "resembling, like," → simulate.

similar matrices
  ماتریس‌های ِ همانند   
mâtrishâ-ye hamânand (#)

Fr.: matrices similaires   

Two → square matrices A and B that are related by B = X-1AX, where X is a square → nonsingular matrix.

similar; → matrix.

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