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: 12948 Search : far
piece
  تکه   
tekké (#)

Fr.: pièce, morceau, tache   

1) A portion of an object or of material, produced by cutting, tearing, or breaking the whole.
2) An item forming part of a set.
3) A written, musical, or artistic creation (OxfordDictionaries.com).

M.E. pece, peece, from O.Fr. piece, from V.L. *pettia, probably from Gaulish (cf. Welsh peth "thing;" Breton pez "piece").

Teké "piece, patch."

piecewise
  تکه‌ای   
tekke-yi

Fr.: par morceaux   

Denoting a → function that is defined on a sequence of → intervals or pieces. For example: |x| = -x for x < 0, x = 0 for x = 0, and x = x for x > 0.

piece, + -wise, → clockwise.

piecewise continuous function
  کریای ِ پیوسته‌ی ِ تکه‌ای   
karyâ-ye peyvaste-ye tekke-yi

Fr.: fonction continue par morceaux   

A function f(x) in an interval if :1) the interval can be divided into a finite number of pieces in each of which f(x) is continuous, and 2) the limits of f(x) as x approaches the boundary point of each piece are finite. In other words, a piecewise continuous function is one that is made up of a finite number of continuous pieces.

piecewise; → continuous; → function.

piezoelectric effect
  اُسکر ِ فشاربرقی   
oskar-e fešârbarqi

Fr.: effet piézoélectrique   

The property exhibited by some crystals (notably quartz) that develop an electric charge or potential difference across them when subjected to mechanical strain; and conversely produce mechanical forces when a voltage is applied to them in a suitable manner.

From piezo-, from Gk. piezein "to press tight" + → electric; → effect.

oskar, → effect; fešârbarqi pertaining to fešârbarq, from fešâr, → pressure, + barq, → electricity.

pile
  تل   
tal (#)

Fr.: pile   

An assemblage of things laid or lying one upon the other (Dictionary.com).

M.E., from M.Fr. pile and directly from L. pila "pillar, mole of stone."

Tal "heap; hill," maybe related to Gk. tylos "a hard and thickened area on the skin, callus, lump," tymbos "burial mound, grave, tomb;" Av. tuma- "fat;" L. tumere "to swell," tumulus "raised heap of earth," tumidus "swollen;" tumor "a swelling."

pillar
  ستون   
sotun (#)

Fr.: pilier   

An elongated structure often found at the interface between an → H II region and its associated → molecular cloud. Also called → elephant trunk. The most famous examples are the "pillars of creation" in the → Eagle Nebula, which are several → light-years in length. There are indications for star formation at the tips of the pillars. In general the pillars point like fingers toward the young → massive stars ionizing the nebula. Most of the mass is concentrated in the head which has a bright rim facing the young stars.

M.E. pillare, O.Fr. piler, from M.L. pilare, from L. pila "pillar, stone barrier."

Sotun "pillar," → column.

pin
  آسه   
âsé (#)

Fr.: axe   

The component of a → planispheric astrolabe that is inserted in the back of the → mater. The pin enables the main parts of the instrument (the → alidade, the → rete, and the → rule) to rotate freely around the common center of the mater and the → tympanum (online museo galileo, VirtualMuseum).

M.E. pinne, from O.E. pinn "peg, bolt," from L. pinna "a feather, plume."

&ACIRC;sé, → axis.

pinch
  پنک   
penk

Fr.: effet de striction   

The constriction of a current-carrying plasma column caused by its external self-magnetic field.

M.E. pinch, from O.Fr. pincier "to pinch," possibly from V.L. *punctiare "to pierce," from L. punctum "point," and *piccare "to pierce."

Penk "pinch, squeezing or compressing between the finger and thumb" (Dehxodâ), cf. (Tabari) pendik, pecelik, (Kermâni) perenju "pinch," maybe related to panjé "the palm of the hand with five fingers; fist," from panj "five," from Mid.Pers. panj; Av. panca; cf. Skt. pánca; Gk. pente; L. quinque; O.E. fif, from P.Gmc. *fimfe (O.S. fif, O.H.G. funf); from PIE base *penkwe "five."

pincushion distortion
  چولگی ِ بالشتکی   
cowlegi-ye bâleštaki

Fr.: distorsion en coussinet   

An → aberration of a → lens  → system in which → magnification increases with → distance from the → optical axis, whereby → horizontal and → vertical lines bend inward toward the → center of the → field. Opposite of → barrel distortion.

Pincushion, from pin, from M.E. pinne, O.E. pinn "peg;" cf. D. pin, Ger. Pinne; perhaps from L. pinna "feather, quill" + cushion, M.E. cuisshin, O.Fr. coissin (Fr. coussin) a variant of V.L. *coxinum, either from L. coxa "hip, thigh," or from L. culcita "mattress;" → distortion.

Cowlegi, → distortion; bâleštaki, adj. of bâleštak, diminutive of bâlešt, variant bâleš "cushion, pillow," Mid.Pers. bâlišn, bâlên "cushion, pillow;" Av. barəiš- "pillow, cushion;" cf. Skt. barhis- "straw, a bed or layer of kusa grass strewed over the sacrificial ground."

pinnule
  مری   
mori (#)

Fr.: pinnule   

In a → planispheric astrolabe, a vane on an end of an → alidade with a hole, slot, or other indicator through which one can view a distant object. There may also be a pointer or pointers on the alidade to indicate a position on a scale.

Diminutive of L. pinna "feather, wing, fin;" + → -ule.

Mori (Biruni).

pinwheel
  فرفره   
ferferé (#)

Fr.: moulin à vent   

A child's toy consisting of a wheel or leaflike curls of paper or plastic loosely attached by a pin to a stick, designed to revolve when blown by or as by the wind (Dictionary.com).

pin; → wheel.

Ferferé "pinwheel," of unknown origin.

pion
  پیون   
piyon (#)

Fr.: pion   

An unstable nuclear particle of mass intermediate between that of a proton and an electron; also called π meson.

From pi (meson) + → -on.

pipe
  ۱) لوله؛ ۲) پیپ   
1) lulé (#); 2) pip (#)

Fr.: 1) tube, tuyau, conduit; 2) pipe   

1) A long tube of metal, plastic, etc, used to conduct water, oil, gas, etc.
2) A device consisting of a tube used for smoking.

M.E., O.E. pipe "musical wind instrument; tube," from V.L. *pipa "a pipe," from L. pipare "to chirp, to peep," of imitative origin (cf. It. pipa, Fr. pipe, Ger. Pfeife, Du. pijp).

1) Lulé, → tube.
2) Pip loan from Fr., as above.

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."

<< < -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 div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>