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: 12955 Search : far
Pipe Nebula
  میغ ِ پیپ   
miq-e pip

Fr.: Nébuleuse de la Pipe   

An extended complex of → molecular clouds in the constellation → Ophiuchus, apparently shaped like a smoker's pipe, about 5° in size and located about 5° away from the → Galactic center. It has a mass of 104 solar masses, lies at a distance of about 130 pc, and is among the closest molecular clouds to Earth. The Pipe Nebula includes a number of → dark nebulae, including Barnard 59, 65, 66, 67, 77, 244, and 256. It is of particular interest because of the almost complete lack of → star formation within it. This cloud is an extremely rare example of a relatively massive molecular cloud that may be in a state of evolution prior to the onset of significant star-forming activity.

pipe; → nebula.

pipeline
  خط ِ لوله   
xatt-e lulé (#)

Fr.: pipeline, conduite, gazoduc, oléoduc, canalisation   

1) A long tubular conduit or series of pipes used to transport crude oil, natural gas, water, etc., often underground and over great distances.
2) A channel or process along which something passes or is provided at a steady rate.

pipe; → line.

Pisces
  ماهی   
Mâhi (#)

Fr.: Poissons   

The Fishes. An extensive but faint constellation of the → Zodiac, representing a pair of fishes, located in the northern hemisphere, at 1h right ascension, 15° north declination. Abbreviation: Psc; genitive: Piscium.

L., plural of piscis "fish," cognate with Goth. fisks, O.E. fisc.

Mâhi "fish," from Mid.Pers. mâhik; Av. masya-; cf. Skt. matsya-, Pali maccha-.

Piscis Austrinus
  ماهی ِ دشتری   
Mâhi-ye daštari

Fr.: Poisson austral   

The Southern Fish. A small constellation in the southern hemisphere, at 22h 30m right ascension, 30° south declination. Its brightest star, → Fomalhaut, has apparent visual magnitude 1.3. Abbreviation: PsA; genitive: Piscis Austrini.

L. piscis "fish," cognate with Goth. fisks, O.E. fisc; austrinus "southern."

Mâhi "fish," → Pisces; daštari "southern," → south.

piston
  پیستون   
piston (#)

Fr.: piston   

A disk or cylindrical part tightly fitting and moving within a cylinder, either to compress or move a fluid collected in the cylinder, as air or water, or to transform energy imparted by a fluid entering or expanding inside the cylinder, as compressed air, explosive gases, or steam, into a rectilinear motion usually transformed into rotary motion by means of a connecting rod (Dictionary.com).

From Fr. piston, from M.Fr. piston "large pestle," from O.It. pistone "a piston," from pestare "to pound," from L.L. pistare, from pistare "to pound."

pitch
  دنگ   
dong

Fr.: hauteur   

The sensation of a sound frequency; the relative highness or lowness that we hear in a sound. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave. In music, a sound that has a definite pitch is called a → tone. Sounds may be generally characterized by pitch, → loudness, and → quality.

M.E. picchen "to thrust, pierce, set;" maybe akin to pick.

Dong "voice, sound," variants bâng, vâng, vang, zang, Tabari šong "cry;" related to vâž, → word.

pitchbelende
  پیچبلند   
pitchbelende (#)

Fr.: pitchbelende   

A natural ore consisting mainly of → uranium oxide, U3O8, with small amounts of → radium, of which is the principal source. It usually contains some → lead and variable amounts of → thorium and → rare-earth elements.

From Ger. Pechblende, from Pech "pitch" (from its black color) + Blende "a mineral."

Pitot tube
  لوله‌ی ِ پیتو   
lule-ye Pitot

Fr.: tube de Pitot   

A → device used to → measure the → velocity of a flowing → fluid. The Pitot tube is used on → aircrafts to determine their → speed. It is also used to meaure water speed of a boat as well as liquid, air, and gas velocities in industrial applications. It is a small tube that has two holes on it. The front hole is placed in the airstream to measure the → stagnation pressure. The side hole measures the → static pressure. The difference between these pressures gives the → dynamic pressure, which can be used to calculate airspeed. See also the → Bernoulli equation.

Named after the French inventor Henri Pitot (1695-1771), a hyraulic engineer; → tube.

pixel
  پیکسل   
piksel (#)

Fr.: pixel   

The smallest useful element of image information.

From pix, plural of pic, short for → picture + el, from → element.

place
  جا   
jâ (#)

Fr.: place, lieu   

An area, position, or portion of space. → mean place

O.E. from O.Fr. place, from M.L. placea "place, spot," from L. platea "courtyard, open space, broad street," from Gk. plateia (hodos) "broad (way)," feminine of platus "broad;" cognate with Av. pərəθu- "broad;" Skt. prthú- "broad, wide;" Lith. platus "broad;" Ger. Fladen "flat cake;" O.Ir. lethan "broad;" PIE base *plat- "to spread."

"place" (from Mid.Pers. giyag "place;" O.Pers. ā-vahana- "place, village;" Av. vah- "to dwell, stay," vanhaiti "he dwells, stays;" Skt. vásati "he dwells;" Gk. aesa (nukta) "to pass (the night);" Ossetic wat "room; bed; place;" Tokharian B wäs- "to stay, wait;" PIE base ues- "to stay, live, spend the night").

place-value notation
  نمادگان ِ جا-ارزشی   
nemâdgân-e jâ-arezeši

Fr.: notation positionnelle   

A mathematical notation system in which the → numerals get different values depending on their position relative to the other numerals. Same as → positional notation and → positional number system.

place; → value; → notation.

plage
  پلاژ   
plâž (#)

Fr.: plage   

A bright cloud-like feature that appears in the vicinity of a sunspot. Plages represent regions of higher temperature and density within the chromosphere. They are particularly visible when photographed through filters passing the spectral light of hydrogen or calcium.

From Fr., from It. piaggia, from L.L. plagia "shore;" noun use of the feminine of plagius "horizontal;" frpm Gk. plagios "slanting, sideways" from plag(os) "side" + -ios adj. suffix.

Plâž, loan from Fr., as above.

plagioclase
  پلاژیوکلاز   
plažioklâz (#)

Fr.: plagioclase   

Any of the → feldspar minerals consisting of a mixture of → sodium and → calcium  → aluminium  → silicates in triclinic crystalline form. Members of the plagioclase group are the most common rock-forming minerals. They are important or dominant minerals in most → igneous rocks of the → Earth's crust.

From Ger. Plagioclase, from Gk. plagio- a combining form meaning "oblique," + clase a suffix used in the formation of compound words that denote minerals with a particular cleavage, as specified by the initial element.

plain
  دشت   
dašt (#)

Fr.: plaine   

An extent of flat land not noticeably diversified with mountains, hills, or valleys.

M.E. from O.Fr. plain, from L. planum "level ground, plain."

Dašt, from Mid.Pers. dašt "plain, open ground."

plan
  ۱) پیشگار؛ ۲) پیشگاریدن، پیشگاشتن   
1) pišgâr; 2) pišgâridan, pišgâštan

Fr.: 1) plan; 2) planifier, préparer   

1a) A scheme or method of acting, doing, proceeding, making, etc., developed in advance.
1b) A representation of a thing drawn on a plane, as a map or diagram.
2a) To arrange a method or scheme beforehand for.
2b) To make plans for (Dictionary.com).

M.E., from Fr. plan "ground plan, map," literally "plane surface," from L. planum "level or flat surface," noun use of adjective planus "level, flat" (from PIE root *pele- "flat; to spread;" Gk. plassein "to mold," plasma "something molded or created;" L. planus "flat, level, even, plain, clear;" Lith. plonas "thin;" O.C.S. polje "flat land, field," Russ. polyi "open;" O.E. feld, M.Du. veld "field."

Pišgâr, literally "beforehand written, painted in advance," from piš- "before, in front," → pre-, + gâr present stem of negâridan, negâštan "to paint, write," → graph.

plan-
  تخت-   
taxt- (#)

Fr.: plan-   

Variant of → plano-.

plano-.

Planck
  پلانک   
Planck

Fr.: Planck   

Short for Max Planck (1858-1947), German physicist, great authority on thermodynamics and creator of the quantum theory.

Planck constant
  پایای ِ پلانک   
pâyâ-ye Planck (#)

Fr.: constante de Planck   

A physical constant that determines the energy of quantum as a function of its frequency; symbol h. Also called → Planck's constant. On 16 November 2018, the International Bureau of Weights and Measures (BIPM) voted to redefine the kilogram by fixing the value of the Planck constant, thereby defining the kilogram in terms of the second and the speed of light. Starting 20 May 2019, the new value is exactly 6.626 070 15 × 10-34 J s. The → reduced Planck constant, ħ = h / 2π, is also called the → Dirac constant.

Planck; → constant.

Planck curve
  خم ِ پلانک   
xam-e Planck

Fr.: courbe de Planck   

Same as → blackbody curve.

Planck; → curve.

Planck density
  چگالی ِ پلانک   
cagâli-ye Planck

Fr.: densité de Planck   

The density corresponding to a → Planck mass in a cubic region of edge length given by the → Planck length: ρP = c5/(ħG2) ≅ 5.16 x 1093 g cm-3, where c is the → speed of light, ħ is the → reduced Planck's constant, and G is the → gravitational constant.

Planck; → density.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee 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 dua dus dwa dyn e-f Ear ecl eco edu eig Ein ela ele ele ele Ele elo emi emp ene Enl env epi equ equ Eri est Euc eva evo exc exc exh Exo exp exp ext ext f(R fac fam fat fee Fer Fib fig fin fir fix fle flu foc for for for fra fre Fre fri fun fuz Gal gal gal Gam gau Gay gen Geo geo geo geo gim glo gov gra gra gra gra gre gro Gun hab hal han Har haz hea hel hel Hen Her het Hig hil hol Hoo hor hou Hub hum hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind Ind inf inf inf inf inn ins ins int int int int int int int int inv ion ion Irr iso iso iso jan jit Jul jus Kel ker kin kni La lam lan Lap las lat Lay Led Len let lif lig lin lin lin liq Lit loc log lon lou low lum lun Lym M d Mag mag mag mag mag mag maj man mar mas mas mat mea mea mec mem mer Mes met met mho mic Mie Mil min mis MKS MOd mol Mon moo mot mul mul myo nak Nas nat neb neg neu neu New New nit noi non non nor nor nuc nuc nul nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi pai Pan par par Par par pas Pav Pel per per per per Per per pha phi pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul pur 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 rep res res res res ret RHB rid rig ris roc Ros rot rub Rut Sag sam sat sca sca Sch sci Sea sec sec see sel sem sen set Sha sha shi shu sid sil sim sin SIS ski Slo smo Soc sol sol sol sol son sou spa spa spe spe spe sph spi spi Spo 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 tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru Tun Tus tym Typ ult unb und uni uni uns upp Urs vac van var Vei Ven ver vic Vir vir vis vol W 4 war wat wav wea wed wet wid win WN2 Wol wri xen yok zen zin > >>