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: 12937 Search : far
orthoscopic
  اردابینی   
ardâbini

Fr.: orthoscopique   

Of or relating to an optical system corrected for → distortion.

ortho-; → -scopic.

orthoscopic eyepiece
  چشمیِ اردابینی   
cešmi-ye ardâbini

Fr.: oculaire orthoscopique   

A telescopic eyepiece that produces a wide field of view (between 40° and 50°). The eyepiece consists of a single element lens that is normally plano-convex, and a cemented triplet that is usually symmetrical.

orthoscopic; → eyepiece.

oscillate
  نویدن   
navidan (#)

Fr.: osciller   

To have, produce, or generate oscillations. → vibrate.

From L. oscillatus, p.p. of oscillare "to swing," from oscill(um) "swing" + -ate a suffix forming verbs from L. words.

Navidan "to swing, oscillate," from nâvidan, literally "to swing like a ship," from nâv "ship;" O.Pers./Av. *nāv-, O.Pers. nāviyā- "fleet;" Skt. nau-, nava- "ship, boat;" Gk. naus "ship;" PIE *nau- "boat."

oscillating Universe
  گیتیِ نونده   
giti-ye navandé

Fr.: Univers oscillatoire   

A cosmological model in which the Universe is closed and undergoes a series of oscillations, each beginning with a big bang and ending with a big crunch.

Oscillating, verbal adj. of → oscillate; → universe.

oscillation
  نَوِش   
naveš (#)

Fr.: oscillation   

The state of any quantity when the value of that quantity is continually changing so that it passes through maximum and minimum values.

Verbal noun of → oscillate.

oscillation mode
  ترز ِ نَوِش، مُد ِ ~   
tarz-e naveš, mod-e ~

Fr.: modes d'oscillation   

Same as → pulsation mode.

oscillation; → mode.

oscillator
  نَوشگر   
navešgar (#)

Fr.: oscillator   

A device for producing sonic or ultrasonic pressure waves in a medium. A device with no rotating parts for converting direct current into alternating current.

Agent noun of → oscillate.

oscillator strength
  زورِ نوشگر   
zur-e navešgar

Fr.: force d'oscillateur   

A quantum-mechanical measure of the probability that a specific atomic transition will occur. It is used in the equation for the absorption coefficient of a spectral line. Also known as f value.

oscillator; → strength.

osculate
  آبوسیدن   
âbusidan

Fr.:   

Geometry: Of a curve, to touch another curve so as to have the same tangent and curvature at the point of contact.

From L. osculatum p.p. of osculari "to kiss," from osculum "kiss," literally "little mouth," diminutive of os "mouth;" PIE *os-/*ous- "mouth;" cf. Av. āh- "mouth;" Skt. ās-, āsán- "mouth;" Hittite aiš- "mouth;" O.Ir. á "mouth;" O.N. oss "mouth."

Âbusidan, from â- a nuance prefix + busidan "to kiss," related to buyidan "to smell," buy "smell, scent;" Mid.Pers. bôy, bôd "smell, scent; consciousness," bôyidan "to smell," Mod./Mid.Pers. bustân "garden," Parthian (prefixed *pati-) pdbws- "to desire; to hope for;" Av. baod- "to perceive, notice, become aware of; to smell of," baoδi- "smell, fragrance," baozdri- "who gets to know sexually;" cf. Skt. bodh- "to wake, awaken; to perceive, pay attention," Buddha "awakened, enlightened;" Gk. peuthomai "to learn, hear;" Lith. budeti "to wake;" O.C.S. bljusti "to take care;" PIE base *bheudh- "to be aware, to make aware."

osculating
  آبوسنده   
âbusandé

Fr.: osculateur   

Relating to → osculate.

Participial adjective of → osculate.

osculating circle
  پرهونِ آبوسنده   
parhun-e âbusandé

Fr.: cercle osculateur   

The circle that touches a curve (on the concave side) and whose radius is the radius of curvature.

osculating; → circle.

osculating elements
  بن‌پارهایِ آبوسشی   
bonpârhâ-ye âbuseš

Fr.: éléments orbitaux osculateurs   

The orbital elements of an osculating orbit.

osculating; → element.

osculating orbit
  مدارِ آبوسنده   
madâr-e âbusandé

Fr.: orbite osculatrice   

The Keplerian orbit that a satellite would follow after a specific time t if all forces other than central inverse-square forces ceased to act from time t on. An osculating orbit is tangent to the real, perturbed, orbit and has the same velocity at the point of tangency.

osculating; → orbit.

osculating plane
  هامُنِ آبوسنده   
hâmon-e âbusandé

Fr.: plan osculateur   

For a curve C at a point p, the limiting plane obtained from taking planes through the tangent to C at p and containing some variable point p' and then letting p' approach p along C.

osculating; → plane.

osculating sphere
  سپهرِ آبوسنده، کره‌یِ آبوسنده   
sepehr-e âbusandé, kore-ye ~

Fr.: sphère osculatrice   

For a curve C at a point p, the limiting sphere obtained by taking the sphere that passes through p and three other points on C and then letting these three points approach p independently along C.

osculating; → sphere.

osculation
  آبوسش   
âbuseš

Fr.: osculation   

The contact between two osculating curves or the like.

Verbal noun of → osculate

OSIRIS-REx
     
OSIRIS-REx

Fr.: OSIRIS-REx   

A → spacecraft whose goal is to collect a sample from the asteroid → 101955 Bennu and bring it back to Earth. It was launched by → NASA on September 8, 2016. OSIRIS-REx will spend two years chasing Bennu down, finally rendezvousing with the → near-Earth asteroid in August 2018. The spacecraft will then study the → asteroid Bennu from orbit for another two years before grabbing at least 60 grams of surface material in July 2020. The sample should reach Earth in 2023. The analysis of the sample would allow to study the role that → B-type asteroids like Bennu, which are primitive and apparently carbon-rich, may have played in helping life appear on Earth.

The name is short for Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer .

osmium
  اسمیوم   
osmiom

Fr.: osmium   

A very hard, brittle metal belonging to the → platinum group elements; symbol Os. → Atomic number 76, → atomic weight 190.2, → melting point 3,045 °C, → boiling point 5,027 °C, → specific gravity 22.57 at 20°C. It was discovered in 1803 simultaneously with → iridium in a crude → platinum ore by the English chemist Smithson Tennant.

From Gk. osme "smell" because of the sharp odor of the volatile oxide.

osmosis
  تراران   
tarârân

Fr.: osmose   

The process by which solvent molecules pass through a partially permeable membrane from a dilute solution into a more concentrated solution, thus equalizing the concentrations of materials on either side of the membrane. → permeability.

Extracted from Fr. endosmose "endosmosis" and exosmose "exosmosis," from Gk. prefixed osmos "a thrusting, a pushing," from othein "to push, to thrust;" cf. Av. vādāiiôit "breaks through, hunts," vadah- "wedge;" Mod.Pers. guvah, gavah "wedge;" Skt. vadh- "to slay, kill," vadha- "killer."

Tarârân, literally "pushing across," from tarâ-, → trans-, + rân present stem of rândan "to push, drive, cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").

osmotic pressure
  فشارِ ترارانی   
fešâr-e tarârâni

Fr.: pression osmotique   

The hydrostatic pressure produced on the surface of a partially permeable membrane by osmosis.

osmotic; → pressure.

<< < -es -iv -ti 217 A s abe abs abs acc acc Ach act act ADa adi adv aff age Alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg arm art ass ast ast ast atm ato att aur aut axi B-t Bai Bal bar bar Be bed Bes BHB bif bim bin Bio bis bla ble blu bod Bol bor bou bra Bre bro Bul cag cal can Can car Car Cas cat CCD cel cen Cet 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 coo cor cor cor cos cos cos cou cou cra cri cro cry cul cur cyc D r dar dat day dea dec dec dec def def deg del den dep des det deu dex dif dif dif dim dip dir dis dis dis dis dis div dom dos dou dri Dum dus dyn dyn ear eas ecl Edd eff Ein eje ele ele ele ele eli emb emi Enc ene ens eph epo equ equ eru eth Eul eve evo exc exc exi exo exp exp ext ext fab fai Fan Fea fem fer fie fil fir fis fla flo flu foc for for Fou fra fre fre fro fun G r Gal gal gam gas Gau gel gen geo geo geo Gho gla goa gra gra gra gra gre Gre gro gyr had hal har har HD Hea Hel hel Her her hid hig Hip hom hor hot Hub Hub hun hyd hyd hyg Hyp ice ide ima imm imp imp inc ind ind ine inf inf inf ini ins ins int int int int int int int int int inv ion iro ise iso iso Jab jet Jov Jur Kel Kep kil kit Kui Lag lam lan Lar Lat law lea lem lep Li- lig lim lin lin lio lit loc lod lon Lor low Lum lun Lup Lyn mac mag mag mag mag mag mai man mar mas mas mat Max mea mec mel mer mes met met met mic mid mil Min mir mix mod mol mom Moo mor mov mul mur nab nar nat neb neg nes neu New New nig nod non non non Nor nua nuc nul Nun OBC obl obs occ oct off Ohm on- ope opp opt opt orb orb org Ori ort Ost out ove p m Pal par par par par Pas pat Peg Peo per per per per per pha Phe pho pho pho phy pin pla pla pla pla pla plu poi pol pol Pol pol pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro pro pro pse pul Pup Qua qua qua qua que rac rad rad rad rad rad rad ran rap 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 Sac sal sat sca sca Sch sci Scu sec sec Sed sel sem sen Ser Sey Sha she sho sid sig sim sin sip ske sli smo soc sol sol sol sol sol sou spa spa spe spe spe spe Spi spi spo squ sta sta sta sta Ste ste ste sto str str str sub sub sub sun sup sup sup sup sur sus sym syn T-s tar Tei tem ter tes the the the the thi thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur Tyc Typ ult unb und uni uni unr upp Urs vac van Var veg Ven ver vib vio vir vis vol VY war wat wav WC8 Web wes whi win WN1 wob wri X-r yoc zen Zhe > >>