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: 1026
plasmon
  پلاسمون   
plâsmon

Fr.: plasmon   

Physics: The quasiparticle resulting from the → quantization of → plasma oscillations. Plasmons are collective oscillations of free electrons inside or on surfaces of materials.

From plasm-, from → plasma + → -on.

plasmonics
  پلاسمونیک   
plâsmonik

Fr.: plasmonique   

The research area dealing with the interaction of → plasmons and → photons and the technology of its practical use. Plasmonics represents one of the most active research fields at the interface of → nanotechnology and → optics.

plasmon; → -ics.

plastic
  شوکایند   
šukâyand

Fr.: plastique   

1a) Capable of being → deformed continuously and permanently without → rupture.
1b) Capable of being molded.
1c) Made or consisting of a plastic.
2) → plastic substance.

From L. plasticus, from Gk. plastikos "that may be molded, pertaining to molding," from plassein "to mold."

Šukâyand, literally "moldable," from šuk, contraction of šuka (Dehxodâ) "a mold in which ingots are cast" + âyand agent noun form of âmadan "to come; to become," → elastic.

plastic deformation
  وادیسش ِ شوکایند   
vâdiseš-e šukâyand

Fr.: déformation plastique   

Permanent → deformation of a → solid subjected to a → stress.

plastic; → deformation.

plastic substance
  زیریست ِ شوکایند   
zirist-e šukâyand

Fr.: substance plastique   

A substance which remains → deformed after an applied → force ceases to act.

plastic; → substance.

plasticity
  شوکایندی   
šukâyandi

Fr.: plasticité   

The property which enables a material to be → deformed permanently without → rupture during the application of a → force. An → elastic material becomes plastic above its → yield point. See also → elasticity, → ductility.

plastic; → -ity.

plate
  ۱) تیغه؛ ۲)؛ ۳) پلاک   
1) tiqé (#); 2); 3) pelâk (#)

Fr.: 1) lame; 2); 3) plaque   

1) Optics: Any crystalline material whose length is much less than its measured diameter. → half-wave plate.
2) A flat piece of material on which a picture or text has been produced.
3) Any of the large movable segments into which the Earth's lithosphere is divided. → plate tectonics.

M.E., from O.Fr. plate "thin piece of metal," from M.L. plata "plate, piece of metal," perhaps via V.L. *plattus, from Gk. platys " flat, broad."

1) Tiqé, from tiq "blade," related to tiz "sharp," variants tig, tež, tej, tij; Mid.Pers. tigr, têz, têž "sharp," O.Pers. tigra- "pointed," tigra.xauda- "pointed helmet (epithet of Scythians)," Av. tiγra- "pointed," tiγray- "arrow," tiži.arštay- "with the pointed spear," cf. Skt. tikta- "sharp, pungent, bitter," tejas- "sharpness, edge, point or top of a flame;" PIE base *st(e)ig- "to stick; pointed." Cognates in other IE languages: Gk. stizein "to prick, puncture," stigma "mark made by a pointed instrument," L. in-stigare "to goad," O.H.G. stehhan, Ger. stechen "to stab, prick," Du. stecken, O.E. sticca "rod, twig, spoon," E. stick.
2); 3) loanword from Fr., as above.

plate center
  مرکز ِ پلاک   
markaz-e pelâk

Fr.: centre de plaque   

The celestial coordinates of the center of the field of an astronomical photographic plate.

plate; → center.

plate scale
  مرپل ِ پلاک   
marpel-e pelâk

Fr.: échelle de plaque   

The scale factor for converting linear measure on a photographic plate to angular measurement on the sky.

plate; → scale.

plate tectonics
  سازانیک ِ پلاک   
sâzânik-e pelâk

Fr.: tectonique des plaques   

The theory supported by a wide range of evidence in which the Earth's crust is composed of several large, thin, relatively rigid plates that move relative to one another. The interaction of the plates at their boundaries causes seismic and tectonic activity along these boundaries. See also → continental drift.

plate; → tectonics.

plateau
  تختال   
taxtâl

Fr.: plateau   

1) An extensive area with a fairly level surface raised sharply above adjacent land.
2) A period, phase, or state of little or no growth or decline in something. → Spite plateau.

From Fr. plateau, from O.Fr. platel "flat piece of metal, wood, etc.," diminutive of plat "flat surface or thing," → plate.

Taxtâl, from taxt "flat;" Mid.Pers. taxtag "tablet, plank, (chess)board" + -âl, → -al.

platelet
  پلاکچه   
pelâkcé

Fr.: plaquette   

1) A small platelike body.
2) One of a variety of forms taken on by → snowflakes.
3) A tiny cell occurring in the blood of vertebrates and involved in clotting of the blood. Formerly called thrombocyte.

plate; → -let.

platinum
  پلاتین   
pelâtin (#)

Fr.: platine   

A silvery metallic → chemical element which is tenacious, malleable, and ductile; symbol Pt. → Atomic number 78; → atomic weight 195.08; → melting point 1,772°C; → boiling point 3,827±100°C; → specific gravity 21.45 at 20°C; → valence +2 or +4. It has several short-lived → radioactive isotopes, with the exception of 190Pt whose → half-life is 6.0 x 1011 years.

From Sp. platina diminutive of plata "silver," from O.Fr. → plate "sheet of metal." The first known reference to platinum can be found in the writing of Italian physician, scholar, and poet Julius Caesar Scaliger (1484-1558). He reported seeing the metal during a visit to Central America in 1557. Aborigines knew of no use for the metal and regarded it as a nuisance in their search for gold and silver. By the end of the 17th century, the Spanish conquistadors started developing the river soil looking for gold and found some gray looking beads together with the gold. They called those little silver beads platina "small silver." They became known as platina del Pinto "granules of silvery material from the Pinto River," a tributary of the San Juan River in the Chocó region of Colombia. The first complete description of platinum was given in 1735 by the the Spanish explorer and naval officer Antonio de Ulloa (1716-1795).

Pelâtin, loanword from Fr.

platinum group element (PGE)
  بن‌پار ِ گروه ِ پلاتین   
bonpâr-e goruh-e pelâtin

Fr.: élément du groupe du platine   

One of the six metals → platinum (Pt), → iridium (Ir), → osmium (Os), → palladium (Pd), → rhenium (Rh), and → ruthenium (Ru) that are grouped together in the → periodic table. They are relatively hard and resistant to corrosion and are used in jewellery and in some industrial applications. All are resistant to chemical attack.

platinum; → group; → element.

Platonic year
  سال ِ پلاتونی، ~ افلاتونی   
sâl-e Plâtoni, ~ Aflâtuni

Fr.: année platonique   

The time required for a complete revolution of the Earth's pole on the celestial sphere as the result of → precession. A Platonic year is equal to 25 800 years.

Of or pertaining to Gk. philosopher Plato, from Gk. Platon "broad-shouldered," from platys "broad." → year.

platykurtic
  پست‌افراشته   
past-afrâšté

Fr.: platycurtique   

A frequency distribution with negative → kurtosis, which has a smaller "peak" around the mean than the corresponding normal distribution. → leptokurtic.

From Gk. platys "flat", → plate + → kurtosis.

Past-afrâšté, literally "lowly elevated," from past "low; plain" (Mid.Pers. past; proto-Iranian *pasta- "fallen," from *pat- "to fall," cf. Av. pat- "to fall; to fly; to rush," patarəta- "winged;" Mid.Pers. opastan "to fall," patet "falls;" Mod.Pers. oftâdan "to fall," oft "fall;" Skt. patati "he flies, falls," pátra- "wing, feather, leaf;" Gk. piptein "to fall," pterux "wing;" L. penna "feather, wing;" O.E. feðer "feather;" PIE base *pet- "to fly, rush") + afrâšté "raised, elevated, erect," p.p. of afrâštan, → kurtosis.

pleasant
  آزوشا   
âzušâ

Fr.: plaisant   

Pleasing, agreeable, or enjoyable; giving pleasure.

M.E., from O.Fr. plaisant, from plaisir, → pleasure.

please
  آزوشیدن   
âzušidan

Fr.: plaire   

1) To act to the pleasure or satisfaction of.
2) To be the pleasure or will of (Dictionary.com).

From M.E. plesen, plaisen, from O.Fr. plaisir "to please, give pleasure to, satisfy," from L. placere "to be acceptable, be liked, be approved," related to placare "to soothe, quiet."

Âzušidan, from prefix â- + zušé, → pleasure, + infinitive suffix -idan.

pleasure
  زوشه   
zušé

Fr.: plaisir   

1) The state or feeling of being pleased.
2) Enjoyment or satisfaction derived from what is to one's liking; gratification; delight.
3) Worldly or frivolous enjoyment (Dictionary.com).

M.E., from O.Fr. plesir, plaisir "enjoyment, delight, desire," from plaisir "to please," from L. placere "to please, give pleasure."

Zusé, from Av. zuš- "to take pleasure;" related to O.Pers. daušta- "friend," Mid.Pers. dôš- "to love, like, choose," dôšišn "pleasure, liking;" Parthian zwš "love;" Mod.Pers. dôst, dust "friend;" cf. Skt. jos- "to like, enjoy;" Gk. geuomai "to taste;" L. gusto "I taste;" gustus "taste, enjoyment."

Pleiades
  پروین   
Parvin (#)

Fr.: Pléiades   

A prominent → open cluster in the constellation → Taurus, popularly called the Seven Sisters. It is a very young cluster of several hundred stars (with spectral types B6 and later), spanning over 1.5 degrees on the sky and about 400 → light-years distant. Six members of the cluster are visible to the → naked eye, the brightest one being → Alcyone. The cluster contains extensive nebulosity, consisting of dust clouds that reflect the light of the → embedded stars. Other designations: M45, NGC 1432.

In Gk. mythology, the seven daughters of Atlas and Pleione, transformed by Zeus into seven stars, from L., from Gk. Pleiades, perhaps literally "constellation of the doves," from a shortened form of peleiades, plural of peleias "dove," from PIE base *pel- "dark-colored, gray."

Parvin, variants Parv, Parvé, Paran, Parand, Parviz, Kurd. Pêrû, Pashtu Pêrûne, Baluchi Panvar; Mid.Pers. Parwiz. According to Bartholomae, it originates from Av. Paoiryaēini-, the first component paoirya- denoting "first." Alternatively, the first element in Parvin may be related to Av. parav-, pauru-, pouru- "full, much, many" (Mod.Pers. por "full, much, very;" Mid.Pers. purr "full;" O.Pers. paru- "much, many," from par- "to fill;" PIE base *pelu- "full," from *pel- "to be full;" cf. Skt. puru- "much, abundant;" Gk. polus "many," plethos "great number, multitude;" O.E. full), denoting "many, numerous," because the object contains several stars.

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