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: 13176 Search : in
sievert (Sv)
  سیورت   
sievert (#)

Fr.: sievert   

The SI unit for the dose equivalent of ionizing radiation. One sievert represents a dosage of 1 → joule per kg of tissue, absorbed from the ionizing radiation. The effect of radiation depends on its total amount of energy, the type of radiation, and the energy levels of particular particles. The dose equivalent in sieverts of radiation is the product of the absorbed dose in → gray (Gy)s and a dimensionless numeric factor, called the quality factor or relative biological effectiveness, dependent on the type of radiation. The sievert has replaced the → rem as the unit of dose equivalent. 1 rem = 10-2 Sv.

The unit honors the Swedish physicist Rolf Sievert (1898-1966), who worked over many years to measure and standardize the radiation doses used in cancer treatment.

sight
  دید   
did (#)

Fr.: visée   

The act or fact of seeing; field of vision. → line of sight.

M.E., from O.E. gesiht, gesihð "thing seen;" cf. Dan. sigte, Swed. sigt, M.Du. sicht, Du. zicht, O.H.G. siht, Ger. Sicht, Gesicht, related to → sign.

Did "sight, vision," past stem of didan "to see" (Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen").

sightline
  دید-خط   
did-xatt

Fr.: ligne de visée   

line of sight.

sight; → line.

sign
  نشان، نشانه   
nešân, nešâné (#)

Fr.: signe   

1) A conventional or arbitrary mark, figure, or symbol used as an abbreviation for the word or words it represents. Related terms: → signal, → signature, → symbol, → index.
2) Math.: A plus sign or minus sign used as a symbol for indicating addition or subtraction; also a sign for indicating the positive or negative value of a quantity.
3) → sign of the zodiac.

M.E., from O.Fr. signe "sign, mark, signature," from L. signum "mark, token, indication, symbol," from PIE base *sekw- "to see."

Nešân "sign, mark," from Mid.Pers. nišân "sign, mark, omen," nišitan "to gaze, stare, look into," niš in marv.niš "taking omen, foretelling, or divining from birds," nišak "clear, evident," from Proto-Iranian *niiaš- "to show," from *ni- "down, below," → ni- (PIE), + *iaš- "to show, appear;" cf. Armenian loanword niš "sign, mark, spot," loaned also in Syriac as nyš "sign" (Cheung 2007).

sign of the zodiac
  برج   
borj (#)

Fr.: signe du zodiaque   

One of the 12 constellations (in fact 13) making up the → zodiac.

sign; → zodiac.

Borj originally "tower," most probably related to Pers. borz "height, magnitude, greatness," boland "high," bâlâ "up, above, high, elevated, height," Laki dialect berg "hill, mountain;" Mid.Pers. burz "height," buland "high;" O.Pers. baršan- "height;" Av. barəz- "high, mount," barezan- "height;" cf. Skt. bhrant- "high;" L. fortis "strong" (Fr. and E. force); O.E. burg, burh "castle, fortified place," from P.Gmc. *burgs "fortress;" Ger. Burg "castle," Goth. baurgs "city," E. burg, borough, Fr. bourgeois, bourgeoisie, faubourg; PIE base *bhergh- "high." Borj may have been loaned into Ar. from Mid.Pers. The meaning extension of borj to its astronomical sense of zodiacal sign may have arisen from the conception of the zodiac as a barrier between heaven and Earth through which access was gained by means of twelve gates.

signal
  نشال   
nešâl

Fr.: signal   

1) Useful part of the received information that can be distinguished from noise.
2) Information transmitted by means of a modulated current or an electromagnetic wave and received by telephone, radio, television, etc.

M.E., from O.Fr. signal, from M.L. signale "a signal," from L.L. signalis (adj.) "used as a signal, pertaining to a sign," from L. signum "signal, sign."

Nešâl, from neš- base of nešân meaning → sign + -âl, → -al.

signal-to-noise ratio
  وابَر ِ نشال-به-نوفه   
vâbar-e nešâl-bé-nufé

Fr.: rapport signal sur bruit   

Concept used to quantify the effects of noise. It is the ratio of a signal to the standard deviation of the signal.

signal; → noise; → ratio.

signature
  نشانزد   
nešânzad

Fr.: signature   

1) Physics, Chem.: A distinctive trace or sign that indicates the presence of a substance or the occurrence of a physical process or event.
2) Telecommunication: The complete set of electromagnetic and/or acoustic signals received, e.g., from an infrared source, a radio or radar transmitter, an aircraft, or a ship. Signatures may consist of analog or digital signals, or both, and may be analyzed to indicate the nature of their source and assist in its recognition.

M.Fr. signature, from M.L. signatura "sign," in classical L. "the matrix of a seal," from signatus, p.p. of signare "to mark, sign," → sign.

Nešânzad, literally "striking a mark, sign" (cf. angošt zadan "fingerprint"), from nešân, → sign, + zad past stem of zadan "to strike, beat; to do; to play an instrument" (Mid.Pers. zatan, žatan; O.Pers./Av. jan-, gan- "to strike, hit, smite, kill" (jantar- "smiter"); cf. Skt. han- "to strike, beat" (hantar- "smiter, killer"); Gk. theinein "to strike;" L. fendere "to strike, push;" Gmc. *gundjo "war, battle;" PIE *gwhen- "to strike, kill").

significance
  نشاناری   
nešânâri

Fr.: significativité   

1) The state or quality of being significant; → meaning; importance.
2) Statistics: An estimated measure of the degree to which a result is not merely a matter of chance. See also → significance level, → significance testing.

From L. significantia "meaning, force, energy," from significans, present participle of significare, → signify.

Nešânâri, noun from nešânâr, → significant.

significance level
  تراز ِ نشاناری   
tarâz-e nešânâri

Fr.: niveau de significativité   

The level of → Type I error which one is willing to risk in a → test of significance. Also called level of significance.

significance; → level.

significance testing
  آزمون ِ نشاناری   
âzmun-e nešanâri

Fr.: test de significativité   

Statistics: A procedure that is used to decide whether to accept or reject the → null hypothesis or to determine whether observed samples differ significantly from expected results. Also called → test of significance and → rule of decision.

significance; → test.

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."

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>