An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
discrimination
  واکربش   
vâkarbeš

Fr.: discrimination   

1) An act or instance of discriminating, or of making a distinction.
2) Unfair treatment of a person, racial group, minority, etc; action based on prejudice (Dictionary.com).

Verbal noun of → discriminate.

discriminatory
  واکربشی   
vâkarbeši

Fr.: discriminatoire   

Characterized by or showing prejudicial treatment, especially as an indication of bias related to age, color, national origin, religion, sex, etc. (Dictionary.com).

From → discriminate + adjective and noun suffix -ory.

discuss
  بهسیدن، بهس (بحث) کردن   
bahsidan, bahs kardan

Fr.: discuter   

To → consider or → examine by → argument, → comment, etc.; talk over or write about, especially to explore solutions; → debate (Dictionary.com).

M.E., from Anglo-Fr. discusser, from L. discussus "struck asunder, shaken, scattered," p.p. of discutere to break up, "strike asunder," from → dis- "apart," + quatere "to shake, strike."

Bahsidan, infinitive from bahs, from Ar. baHS (بحث) "investigating, examining, controversy, debate, dispute."

discussion
  بهس، بحث   
bahs

Fr.: discussion   

An act or instance of discussing; → consideration or → examination by → argument, → comment, etc., especially to explore solutions; informal debate (Dictionary.com).

Verbal noun from → discuss.

dish
  جام   
jâm (#)

Fr.: antenne parabolique   

A large parabolic structure that collects radio waves and focuses them on a detector by means of a secondary reflector. A similar device used as antenna for radar transmitting.

O.E. disc "plate, bowl, platter," from L. discus "dish, platter, quoit," from Gk. diskos "disk, platter."

Jâm "cup, chalice, goblet, bowl," Mid.Pers. jâm "vessel, goblet; glass," Av. yama- "glass, glass vessel," yāmô.pacika- "baked glass;" related to Skt. camasa- "a vessel used at sacrifices for drinking Soma, kind of flat dish or cup?"

disinfect
  وافژیدن   
vâfažidan

Fr.: désinfecter   

To remove infection the use of appropriate means.

dis-; → infect.

disinfectant
  وافژنده   
vâfažande

Fr.: infectant   

Any agent, such as a chemical, heat, or radiation, that destroys or inhibits the growth of disease carrying microorganisms.

disinfect; → -ant.

disintegration
  واپاشی، فروپاشی   
vâpâši, forupâši (#)

Fr.: desintégration   

The breaking up of a body into fragments. For example, that of an unstable nuclei either spontaneously or as a result of bombardment by fast-moving particles, or the breaking up of a comet.

Disintegration, verbal noun of disintegrate, from → dis- + → integration.

Vâpâši, forupâši, from vâ-, frou-de- + pâši, noun of pâšidandisperse.

disjunct
  واجوهه   
vâjuhé

Fr.:   

Any of the components in a logical → disjunction.

disjunction.

disjunction
  واجوهش   
vâjuheš

Fr.: disjonction   

A → proposition of the form "A or B" (A ∨ B), where A and B are themselves propositions. A disjunction is → true when one or the other of its components (called → disjuncts) is true, and false otherwise.

dis-; → junction.

disk
  گرده، دیسک   
gerdé (#), disk

Fr.: disque   

1) General: Any thin, flat, circular plate or object.
2) Math.: The domain bounded by a circle.
3) Astro.: A thin, flattened material structure encompassing a central object, such as a star or a galactic nuclear region. → accretion disk; → circumnuclear disk; → circumstellar disk; → galactic disk.

Computers: Any of several types of material support on which data can be encoded.

From L. discus "quoit, discus, disk," from Gk. diskos, from dikein "to throw." → dish.

Gerdé, from Mid.Pers. girdag "disk, round," from gird/girt "round, all around," Proto-Iranian *gart- "to twist, to wreathe," cf. Skt krt "to twist threads, spin; to wind; to surround;" kata- "a twist of straw," Pali kata- "ring, bracelet," Gk. kartalos "a kind of basket," kyrtos "curved;" disk loanword from Fr.

disk accretion
  فربال ِ گرده‌ای، ~ پت گرده، ~ ~ دیسک   
farbâl-e gerde-yi, ~ pat geredé, ~ ~ disk

Fr.: accrétion par disque   

An accretion process involving an → accretion disk.

disk; → accretion.

disk galaxy
  کهکشان ِ گرده‌دار   
kahkešân-e gerdedâr

Fr.: galaxie à disque   

A galaxy consisting of a thin disk of stars and → interstellar matter which may include → spiral arms and → bar.

disk; → galaxy.

disk instability
  ناپایداری ِ گرده، ~ دیسک   
nâpâydâri-ye gerdé, ~ disk

Fr.: instabilité de disque   

1) General: The process by which an → accretion disk cools, causing it to fragment into self-gravitating → clumps.
2) A model of → planet formation in which a region of a → circumstellar disk becomes dense and cool enough to be unstable to → gravitational collapse, resulting in the formation of a gaseous → protoplanet. Disk instability has been put forward as a mechanism for forming massive → giant planets on short time-scales (1 Ky-1 My).
3) In models of galactic structure, a process that is thought to cause the formation of → pseudo-bulges.
4) → disk instability model (DIM).

disk; → instability.

disk instability model (DIM)
  مدل ِ ناپایداری ِ گرده، ~ ~ دیسک   
model-e nâpâydâri-ye gerdé, ~ ~ disk

Fr.: modèle d'instabilité de disque   

A model describing → dwarf novae and → Soft X-ray Transient (SXT)s. Accordingly, these objects are triggered by an → accretion disk instability due to an abrupt change in opacities (→ opacity) at → temperatures at which hydrogen is partially ionized. All versions of the DIM have this ingredient. They differ in assumptions about → viscosity, and about what happens at the inner and outer disk radii. Basically, during → quiescence, material accumulates in the accretion disk until a critical point is reached. The disk then becomes unstable and is dumped onto the → compact object, releasing a burst of → X-rays. However, the greater duration of SXT bursts (months) and the time interval between bursts (decades) cannot be accounted for by the standard disk instability model used for dwarf novae, and additional factors such as X-ray illumination and irradiation of the accretion disk are required for the model to match the observed properties of SXTs (J-P Lasota and J-M Hameury, 1995).

disk; → instability; → model.

disk locking
  گیرکرد ِ دیسک، ~ گرده   
girkard-e disk, ~ gerdé

Fr.: blocage de disque   

In star formation models involving magnetized accretion, a process whereby the stellar rotational → angular velocity becomes equal to the → Keplerian angular velocity of the → accretion disk. This happens at the → corotation radius. Disk locking is believed to be responsible for efficient loss of stellar → angular momentum during the → pre-main sequence contraction of → T Tauri stars. These stars are expected to spin up by a factor of about 3 due to contraction after being magnetically disconnected from the → circumstellar disk. However, observations show that a large fraction of pre-main sequence stars evolve at nearly constant angular velocity through the first 4 Myr. This process results from → magnetic braking. The idea of magnetic disk locking originated with the theory developed by Ghosh & Lamb (1979, ApJ 232, 259) for → neutron stars.

M.E., from O.E. lucan "to lock, to close," from loc "bolt, fastening, enclosure;" cf. M.L.G. lok, O.H.G. loh, O.N. lok "a cover, lid," Goth. -luk in usluk "opening," Ger. Loch "opening, hole," Du. luck "shutter."

Girkard, from gir "hold, block," from gereftan "to seize, hold, take," → eclipse, + kard noun from kardan "to do," → work.

disk partition
  پرکش ِ دیسک، ~ گرده   
parkeš-e disk, ~ gerde

Fr.: partition de disque   

A logical division of a hard disk that is treated as a separate unit by operating systems and file systems.

disk; → partition.

disk population
  پرینش ِ گرده، ~ ِ دیسک   
porineš-e gerdé, ~ disk

Fr.: population disque   

Of a spiral galaxy, those stars that lie in a flattened disk and move in nearly circular orbits around its centre. They are Population I stars of all ages up to the age of the disk, but in general are younger than stars in → halo population.

disk; population, from L.L. populationem "a people, multitude," from populatio, from populare "to inhabit," from populus "people," related to plebes "the common people," cf. Gk. plethos "people, multitude, great number," from PIE base *pel- "to be full;" Mod.Pers. por "full," O.Pers. paru- "much, many," Av. pouru- "much, many," pərəna- "full," par- "to fill," Skt. puru-, Gk. polus, O.E. full "completely, full," from P.Gmc. *fullaz, O.H.G. fol, Ger. voll, Goth. full.

Like Gk., Pers. uses the concepts of "multitude, many, full" to denote "people, group, herd, flock". The following examples are all terms derived from O.Pers. paru- "much, many," Av. par- "to fill," pouru- "much, many," pərəna- "full" (Mod.Pers. por "full"): literary Pers. bâré "herd, flock," parré "a rank or file of soldiers, a circular disposition of troops," Lori, Qâyeni bor "group, tribe, herd," Torbat-Heydariyeyi, Qomi borr "heap, bundle, group," Qomi borreh "group, assemblage of people," Pashtu parrak "flock, herd," Urdu para "flock, herd," Lârestâni baila "group, tribe," Tabari balik "herd, flock." With this introduction, porineš "population," verbal noun of porinidan "to populate," infinitive of porin "populous," from por "mutitude, many, full" + -in attribution suffix.

disk quota
  بهرال ِ دیسک   
bahrâl-e disk

Fr.: quota de disque   

Computers: The specific amount of disk space that a user or service is allowed to use.

disk; → quota.

disk settling
  نیاشش ِ گرده، ~ دیسک   
niyâšeš-e gerdé, ~ disk

Fr.: stabilisation de disque   

The process whereby a → galaxy evolves from a disturbed to an ordered system, as it develops into a → rotation dominated → settled disk.

disk; → settling.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu 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 Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>