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
sonde
  گمانه   
gomâné

Fr.: sonde   

A rocket or balloon carrying instruments to probe conditions in the upper atmosphere.

From Fr. sonde "ounding line; plumb line."

Gomâné "a shaft sunk in order to ascertain the depth of the water when making a subterraneous canal," from Proto-Iranian *vi-mā-, from vi- "apart, away from, out" (cf. Av. vi-; O.Pers. viy- "apart, away;" Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + mā- "to measure" (cf. O.Pers./Av. mā(y)- "to measure;" Mod.Pers. mâ/mun/mân "measure," as in Pers. terms âz- "to test;" pirâmun "perimeter," âzmun "test, trial," peymân "measuring, agreement," peymâné "a measure; a cup, bowl;" PIE base *me- "to measure;" cf. Skt. mati "measures," matra- "measure;" Gk. metron "measure;" L. metrum).

sonic
  صدایی   
sedâyi (#)

Fr.: sonique   

Of, relating to, or being the speed of sound in a medium.

From L. sonus, → sound.

Sedâyi, pertaining to sedâ, → sound.

sonic boom
  غریو ِ صدا   
qariv-e sedâ (#)

Fr.: bang sonique   

A noise caused by a shock wave that emanates from an object traveling at or above the speed of sound.

sonic; boom, M.E. bombon, bummyn "to buzz;" cf. Du. bommen, Ger. bummen, word made by sound imitation.

Qariv "shout, clamour, cry;" sedâyi, → sonic.

sonic point
  نقطه‌ی ِ صدایی   
noqte-ye sedâyi

Fr.: point sonique   

The point where the → stellar wind makes a transition from → subsonic to → supersonic flow. In the particular case of a spherically symmetric wind (thus with no magnetic field), the distance from star, at which the sonic point occurs, is given by: rs = (GM*)/2cs2, where G is the → gravitational constant, M* is the stellar mass, and cs the → sound speed at the sonic point.

sonic; → point.

sorb
  شمیدن   
šamidan

Fr.:   

To gather on a surface either by absorption, adsorption, or a combination of the two processes.

Verb, from sorption, extracted from → absorptionadsorption, from L. sorbere "suck in," from PIE base *srebh- "to suck, absorb" (cf. Arm. arbi "I drank;" Gk. rhopheo "to gulp down;" Lith. srebiu "to drink greedily").

Šamidan, from šam, variant of šâm, as in âšâm, âšâmidan "to drink, to sip;" Av. šam- "to drink, sip, swallow;" Skt. cam, camati "to sip, dirink, lick up, absorb."

sorption
  شمش   
šameš

Fr.: sorption   

The process of sorbing. The state of being sorbed. → absorption; → adsorption.

Verbal noun of → sorb

Sothic period
  دوره‌ی ِ تیشتری   
dowre-ye Tištari

Fr.: période sothique   

The interval after which the heliacal rising of the star Sirius occurs at the same time of the year. It is a period of 1,460 Sothic years.

From Fr. sothique, from Gk. Sothis, an Egyptian name of Sirius; → period.

Tištari, of or pertaining to Tištarserius; dowré, → period.

Sothic year
  سال ِ تیشتری   
sâl-e Tištari

Fr.: année sothique   

The Egyptian year of 365 days and 6 hours, as distinguished from them Egyptian vague year, which contained 365 days.

From Fr. sothique, from Gk. Sothis, an Egyptian name of Sirius; → year.

Tištari, of or pertaining to Tištarserius; sâl, → year.

sound
  ۱) صدا؛ ۲) دروا   
1) sedâ (#); 2) dorvâ

Fr.: 1) son; 2) sain   

1) A physiological sensation received by the ear. It is caused by a vibrating source and transmitted as a longitudinal pressure wave motion through a material medium such as air.
2a) Free from damage, injury, decay, etc.
2b) Describing an → argumentiff its → reasoning is → valid and all its → premises are → true.
2c) Logic: A formal system is sound if all the → inferences that are permitted by the rules of the system are valid inferences, that is, if no invalid arguments are provable within the system. → soundness.

1) M.E. soun; O.Fr. son, from L. sonus "sound," sonare "to sound;" PIE base *suen- "to sound;" cf. Av. xvan- "to sound;" Pers. xvân-, xvândan "to sing, read;" Skt. svana- "sound," svan- "to sound," svanati "it sounds;" O.E. swinn "music, song" (Cheung 2007).
2) M.E. sund, from O.E. gesund "sound, safe, having the organs and faculties complete and in perfect action," cf. O.S. gisund, O.Fris. sund, Du. gezond, O.H.G. gisunt, Ger. gesund "healthy," as in interjection gesundheit.

1) Sedâ "sound," most probably a Pers. term, since it exists also in Indo-Aryan languages: Skt. (late Vedic): sabda "articulate sound, noise," Pali and Prakriti: sadda "sound, noise," Sindhi: sadu, sado "shout, call," Gujrâti sad "call, voice, echo," Marathi: sad "shouting to," Konkani sad "sound," Sinhali: sada "sound." Therefore, sadâ in Ar. "reverberating noise, echo" maybe a loan from Pers., or a coincidence. Note that for the author of the classical Pers. dictionary Borhân-e Qâte' (India, 1652 A.D.), the Ar. term is a loanword from Pers.
2) Dorvâ (Dehxodâ) "whole, right, just;" Qâyeni, Gonâbâdi, Tabasi, Râvari dorvâx "healthy, whole," dorvâxi "health" (related to Pers. dorud "benediction, praise," dorost "whole, healthy, right"); cf. Sogd. žûk (from *druva-) "healthy;" O.Pers. duruwa- "healthy, firm, secure;" Av. druua- "healthy, firm, sound," druuatāt "health, soundness," drvô.cašman- "of sound eyes;" Skt. dhruvá- "fixed, firm;" → integral.

sound barrier
  دیوار ِ صدا، ورغه‌ی ِ ~   
divâr-e sedâ, varqe-ye ~

Fr.: mur du son   

A sharp increase in aerodynamic drag that occurs as the speed of an aircraft approaches the speed of sound. Also called sonic barrier.

sound; → barrier.

sound energy
  کاروژ ِ صدا   
kâruž-e sedâ

Fr.: énergie acoustique   

The energy which → sound waves impart to a medium. Same as acoustic energy.

sound; → energy.

sound field
  میدان ِ صدا   
meydân-e sedâ

Fr.: champ acoustique   

The distribution of → sound energy in a defined space.

sound; → field.

sound horizon
  افق ِ صدا   
ofoq-e sedâ

Fr.: horizon sonore   

The maximum distance a → sound wave could have traveled through the ionized plasma from the → Big Bang until the → recombination era. It is 150 → Mpc, or bout 500 million → light-years. Sound horizon is the equivalent of the concept of → cosmic horizon, where one replaces → electromagnetic wave by → sound wave. The sound horizon is a fixed physical scale at the → last scattering surface. Cosmological models relate the value of sound horizon to the angle it subtends on the sky today. Same as acoustic horizon and sonic horizon. See also → CMB angular power spectrum.

sound; → horizon.

sound intensity
  درتنویی ِ صدا   
dartanuyi-ye sedâ

Fr.: intensité de son   

The average → sound power passing through a unit area perpendicular to the direction that the sound is traveling. It is usually expressed in watts per square meter.

sound; → level.

sound intensity level
  تراز ِ درتنویی ِ صدا   
tarâz-e dartanuyi-ye sedâ

Fr.: niveau de l'intensité de son   

The expression of sound intensity in decibel units. The sound intensity level (LI), in decibels, is computed as: LI = 10 log (I/I0), where I is the measured sound intensity and I0 is the reference intensity (1 x 10 -12 watt per square meter).

sound; → intensity; → level.

sound power
  توان ِ صدا   
tavân-e sedâ

Fr.: puissance de son   

The → sound energy emitted by a source per unit time, usually expressed in → watts. Sound power causes → sound pressure.

sound; → power.

sound power level
  تراز ِ توان ِ صدا   
tarâz-e tavân-e sedâ

Fr.: niveau de la puissance de son   

The sound energy emitted by a sound source per unit time and expressed in → decibels. Sound power, in → watts, is converted to sound power level in decibels (L), by L = 10 log (W/W0), where W0 is the reference power (1 x 10 -12 watt).

sound; → power; → level.

sound pressure
  فشار ِ صدا   
fešâr-e sedâ

Fr.: pression de son   

The periodic fluctuation above and below atmospheric pressure created by an oscillating body which provides the → sound power. Instantaneous sound pressure is the peak value of air pressure.

sound; → pressure.

sound quality
  چونای ِ صدا   
cunâ-ye sedâ

Fr.: qualité de son   

The number of → overtones present in a sound and their respective intensity. Like → loudness, it is a subjective quantity and cannot be measured with instruments.

sound; → quality.

sound speed
  تندی ِ صدا   
tondi-ye sedâ

Fr.: vitesse du son   

The velocity of propagation of a → longitudinal wave in a medium under specified conditions. Also known as sonic speed, sonic velocity, acoustic velocity, sound velocity, velocity of sound, speed of sound. The speed of sound is a thermodynamic property that relates to the change in pressure and density of the medium and can be expressed as C = (dP/dρ)1/2, where C is the sound velocity, dP is the change in pressure, and dρ the change in density. It can also be expressed as C = (E/ρ)1/2, where E is the bulk modulus elasticity. This equation is valid for liquids, solids and gases. The sound travels faster through media with higher → elasticity and/or lower density. If a medium is → incompressible the speed of sound is infinite. For → ideal gases, a simple relationship exists between the sound speed and temperature: C = (γR T)1/2, where γ is the → specific heat ratio (CP/CV), and R is the → gas constant. We see that for ideal gases it the speed is independent of pressure. In air at 0°C it is 332 m/sec. The speed of sound in a gas of hydrogen is 1315 m/s. → Mach number.

sound; → speed.

<< < -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 > >>