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: 685
discontinuity
  ناپیوستگی   
nâpeyvastegi (#)

Fr.: discontinuité   

A break in sequence or continuity of anything. → Balmer discontinuity
Math.: A point at which a function is not continuous.
Geology: A surface separating rock layers of differing properties or compositions.

M.L. discontinuitas, from discontinuus, from → dis- + continuus, → continuous.

Nâpeyvastegi, noun from nâpeyvasté "discontinuous," from nâ- "non, un-," → a-, + peyvasté, → continuous.

discover
  پدواریدن، کشف کردن   
padvâridan, kašf kardan

Fr.: découvrir   

To find (something previously unseen or unknown) after study or search.

M.E. discoverir, descovrir, from O.Fr. descovrir "uncover, unveil, reveal," from L.L. discooperire, from L. → dis- "opposite of" + cooperire "to cover up," → cover.

Padvâridan "to uncover," infinitive from padvâr, from prefix pad- "against, contrary, opposite to," variants pat-, pâd-, → anti-, + vâr- "to cover;" cf. Av. vār- "to cover;" Mid.Pers. (with prefix *uz-) uzvâr- "to interprete, uncover, grasp," Pers. hozvâr(eš) "interpretation;" Khotanese (+ *ui-) gvir- "to be revealed;" Choresmian (+ *apa-) bw'rg- "to uncover;" Pers. barg "cover, clothes;" šalvâr "trousers" (Cheung, 2007).

discovery
  پدوار، پدوارش، کشف   
padvâr, padvâreš, kašf

Fr.: découverte   

The act or an instance of discovering. Something discovered.

Verbal noun of → discover.

discrepancy
  ناهم‌خوانی   
nâhamxâni (#)

Fr.: écart, désaccord   

Divergence or disagreement, as between facts, claims, or calculations.

From L. discrepantia, from discrepantem, pr.p. of discrepare "sound differently, differ," from → dis- "apart, off" + crepare "to rattle, crack."

Nâhamxâni, from nâ- "non, un-," → a-, + hamxâni "siniging together," from ham- "together," → com-, + xâni, from xân stem of xândan "to sing; to read; to call," Mid.Pers. xwân- "to resound; to call," Av. xvan- "to sound," Proto-Iranian *huan- "to call;" cf. Skt. svan-, sváranti "to sound, make a sound, sing;" L. sonus "sound," sonare "to sound;" O.E. swinn "music, song," PIE base *suen- "to sound" (Cheung 2007).

discrete
  گسسته، جدا   
gosasté, jodâ (#)

Fr.: discret   

Apart or detached from others; separate; distinct. Composed of distinct or discontinuous elements.

From O.Fr. discret, from L. discretus "separated, distinct," from p.p. of discernere "to distinguish," from → dis- "off, away" + cernere "distinguish, separate, sift," → crisis.

Gosasté "broken, broken off," p.p. of gosastan "to break, split," Mid.Pers. wisistan "to break, split," Av. saed- "to split," asista- "unsplit, unharmed," Skt. chid- "to split, break, cut off," Gk. skhizein "to split," L. scindere "to split;" PIE stem *skei- "to split, cut."
Jodâ "separate, distinct," Mid.Pers. jutâk (yutâk), jut (yut).

discrete absorption component (DAC)
  همنه‌ی ِ درشمی ِ گسسته   
hamne-ye daršami-ye gosasté

Fr.: composante d'absorption discrète   

The rapid, systematic changes in the absorption parts of the → P Cygni profiles of the ultraviolet → resonance lines (Si IV, C IV, and N V) observed in a majority of massive → hot stars. DACs are typically seen to accelerate to the → blue wing of the profile over a few days, becoming narrower as they approach the → terminal velocity.

discrete; → absorption; → component.

discrete data
  داده‌های ِ گسسته   
dâdehâ-ye gosasté (#)

Fr.: données discrètes   

Data that can only take a small set of particular values, usually whole numbers. For instance, number of children in a family cannot be 2.4, since parents cannot actually have 2.4 children. → continuous data.

discrete; → data.

discrete radio source
  خن ِ رادیویی ِ جدا   
xan-e râdioyi-ye jodâ

Fr.: radiosource discrète   

A localized source on the celestial sphere that can be observationally separated at radio wavelengths from its background emission.

discrete; → radio; → source.

discrete spectrum
  بیناب ِ گسسته   
binâb-e gosasté

Fr.: spectre discret   

A spectrum in which the component wavelengths (and wave numbers and frequencies) constitute a discrete sequence of values (finite or infinite in number) rather than a continuum of values.

discrete; → spectrum.

discrete transition
  گذرش ِ گسسته   
gozareš-e gosasté

Fr.: transition discrète   

A transition between two quantum-mechanical energy levels. See also → discrete spectrum.

discrete; → transition.

discrete value
  ارزش ِ گسسته   
arzeš-e gosasté

Fr.: valeur discrète   

A quantity that has certain magnitudes and does not represent a → continuous variable.

discrete; → value.

discrete variable
  ورتنده‌ی ِ گسسته   
vartande-ye gosasté

Fr.: variable discret   

A variable which has only → discrete values and has no in-between values.

discrete; → variable.

discrete-time quantum walk
  پویش ِ کو‌آنتومی با زمان ِ گسسته   
puyeš-e kuântomi bâ zamân-e gosasté

Fr.: marche quantique à temps discret   

A → quantum walk involving a probabilistic → operator that changes the direction while leaving the position fixed, and a shift operator that changes the position. Discrete-time quantum walk was introduced by J. Watrous (2001, Journal of Computer and System Sciences 62, 376)

discrete; → time; → quantum; → walk.

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?"

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.

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