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: 13116 Search : far
Pherkad (γ Ursae Minoris)
  فرقد   
Farqad (#)

Fr.: Pherkad (γ UMi)   

A blue → giant star in the constellation → Ursa Minor, also known as HR 5735, HD 137422, HIP 75097, BD+72°79, and SAO 8220. It has an → apparent visual magnitude of +3.0, → color indices of B -V = +0.09, U - B = +0.08, and a → spectral type of A2 III. Pherkad has a → luminosity of 1,100 Lsun, a radius of 15 Rsun, and a → surface temperature of 8,200 K. It lies 487 → light-years away from Earth.

From Ar. Al-Farqad (الفرقد) "calf."

Phillips relation
  بازانش ِ فیلیپس   
bâzâneš-e Phillips

Fr.: relation de Phillips   

A correlation between the peak brightness of → Type Ia supernovae and the decline rate of their → light curve (15 days after the maximum). The decline rate is also correlated to the width of the peak brightness of the supernova. The brightest events are the broadest in time and brighter SNe Ia decline more slowly than dimmer ones. Applying the Phillips relation reduces the dispersion in the light curves of Type Ia SNe thus making them precise distance indicators which can be observed over large distances.

Named after Mark M. Phillips (1951-), American astronomer (Phillips et al. 1993, ApJ 413, L105); → relation.

philosopher
  فیلسوف، فلسفه‌دان   
filsuf (#), falsafedân (#)

Fr.: philosophe   

A person who engages in → philosophy.

M.E., from O.E. philosophe, from L. philosophus "philosopher," from Gk. philosophos "philosopher, sage," literally "lover of wisdom," → philosophy; the agent noun ending -er appears in early 14th century from an Anglo-French or O.Fr. variant of philosophe.

Filsuf, from Ar., from Gk., as above. Falsafedân, literally "philosophy knower," with -dân present stem of dânestan "to know," → science.

philosophize
  فلسفیدن   
falsafidan (#)

Fr.: philosopher   

To explain or argue in terms of philosophical speculations or theories.

philosophy; → -ize.

philosophy
  فلسفه   
falsafé (#)

Fr.: philosophie   

A conceptual study that attempts to understand reality and answer fundamental questions about knowledge, existence, life, morality, and human nature. Philosophy deals with issues that generally are not subject to investigation through experimental verification. It focuses on questions which cannot be answered by means of observation alone. See also → philosophy of science.

From O.Fr. filosofie "philosophy, knowledge," from L. philosophia, from Gk. philosophia "love of wisdom," from philo- "loving" combining form of philos "dear; friend," from philein  "to love," of unknown origin, +  sophia "knowledge, wisdom," from sophis "wise, learned;" of unknown origin.

Falsafé, from Ar. falsafah, loan from Gk. philosophia, as above.

philosophy of science
  فلسفه‌ی ِ دانش   
falsafe-ye dâneš (#)

Fr.: philosophie des sciences   

The critical study of the basic principles and concepts of a particular branch of  knowledge. The philosophy of science is particularly concerned with the nature of scientific facts, the structure of scientific statements, and relations between them.

philosophy; → science.

phlogiston
  فلوژیستون   
fložiston (#)

Fr.: phlogiston   

A hypothetical substance that, prior to the discovery of → oxygen, was thought to be released during → combustion. → phlogiston theory.

From New Latin, from Gk. phlogiston, neuter of phlogistos "inflammable, burnt up," from phlogizein "to set on fire, burn," from phlox "flame, blaze;" from PIE root *bhel- "to shine, burn."

Fložiston, loan from Fr, as above.

phlogiston theory
  نگره‌ی ِ فلوژیستون   
negare-ye fložiston

Fr.: phlogistique   

An obsolete theory of combustion in which all flammable objects were supposed to contain a substance called → phlogiston, which was released when the object burned. The existence of this hypothetical substance was proposed in 1669 by Johann Becher, who called it terra pinguis "fat earth." For example, as wood burns it releases phlogiston into the air, leaving ash behind. Ash was therefore wood minus phlogiston. In the early 18th century Georg Stahl renamed the substance phlogiston. The theory was disproved by Antoine Lavoisier in 1783, who proved the principle of conservation of mass, refuted the phlogiston theory and proposed the oxygen theory of burning.

phlogiston; → theory.

Phobos
  فوبوس   
Fobos (#)

Fr.: Phobos   

The inner → satellite of → Mars orbiting less than 6,000 km above the surface of Mars, closer to its → primary than any other → moon in the → solar system. Phobos is irregularly shaped, 27 x 22 x 18 km in size and orbits Mars in 0.319 days. Phobos' orbit is decaying at a rate of about 2 centimeters per year; it is therefore expected to break up and crash onto Mars within the next 50 million years. See also: → Roche limit, → orbit decay.

In Gk. mythology, Phobos is one of the sons of Ares (Mars) and Aphrodite (Venus). The name means "fear, panic, flight."

Phoebe
  فویءبه   
Foebé (#)

Fr.: Phoebé   

The outermost of Saturn's known satellites, also known as Saturn IX. It is 220 km in diameter and orbits Saturn in 550.5 days at a distance of 12,952,000 km.

In Gk. mythology, Phoebe is the daughter of Uranus and Gaia; grandmother of Apollo and Artemis.

Phoebe ring
  حلقه‌ی ِ فو‌ءبه   
halqe-ye Phoebe

Fr.: anneau de Phœbé   

A giant ring around Saturn spanning an area of space from a distance of ~ 128 Saturn equatorial radii, RS (60,330 km) to 207 RS, that is, from about 7.7 × 106 to 12.4 × 106 km from the planet. Its vertical thickness is about 40 RS. The Phoebe ring was detected in 2009 using NASA's infrared → Spitzer Space Telescope. The Phoebe ring is made up mainly of dust particles about 10 to 20 microns in size, or about one-tenth to one-fifth the average width of a human hair. Rocks that are the size of soccer balls or larger with diameters of more than about 20 cm make up no more than about 10 percent of the ring (Verbiscer et al., 2009, Nature, 461, 1098).

Phoebe; → ring.

Phoenix
  ققنوس   
Qoqnos (#)

Fr.: Phénix   

A constellation in the southern hemisphere, at 0h 30m → right ascension, 50° south → declination. Its brightest star Alpha Phoenicis is of magnitude 2.4. Abbreviation: Phe; genitive: Phoenicis.

L. Phoenix, also phenix, from Gk. phoinix a mythical bird of great beauty which according to one account lived 500 years, burned itself to ashes on a pyre, and rose alive from the ashes to live another period.

Qoqnos, from Ar., from Gk., as above, or, for some reasons (mistake?), from Gk. kuknos, → Cygnus.

phone
  آوا   
âvâ (#)

Fr.: son   

A speech sound considered as a physical event without regard to its place in the sound system of a language.

From Gk. phone "voice, sound," phonein "to speak;" cf. L. fama "talk, reputation, fame."

Âva "voice, sound," related to âvâz "voice, sound, song" (both prefixed forms), bâng "voice, sound, clamour" (Mid.Pers. vâng), vâžé "word," variants vâj-, vâk-, vâ-, vâz-, vât-; Av. vacah- "word," vaocanghê "to decalre" (by means of speech), from vac- "to speak, say;" cf. Skt. vakti "speaks, says," vacas- "word;" Gk. epos "word;" L. vox "voice;" PIE base *wek- "to speak."

phoneme
  واج   
vâj (#)

Fr.: phonème   

The smallest phonetic unit in a language that can distinguish one word from another.

From Fr. phonème, from Gk. phonema "speech sound, utterance," from phonein "to sound," → phone.

Vâj "voice," variant of vâž, vâz-, âvâz etc., → phone.

phonetics
  آواییک   
âvâyik (#)

Fr.: phonétique   

A branch of linguistics dealing with the analysis, description, and classification of speech sounds. More specifically, phonetics deals with the physical production of → phonemes regardless of language, while → phonology studies how those sounds are put together to create meaningful words in a particular language.

From phonetic, from N.L. phoneticus, from Gk. phonetikos "vocal," from phonet(os) "utterable," verbal adj. of phonein "to speak clearly, utter," from → phone + -ikos, → -ics.

&ACIRC;vâyik, from âvâ, → phone, + -ik, → -ics.

phono-
  آوا-   
âvâ- (#)

Fr.: phono-   

A combining form meaning "sound, voice," used in the formation of compound words. Also phon-, especially before a vowel.

From Gk. phon-, phono-, form → phone "voice, sound, speech"

phonology
  آواشناسی   
âvâšnâsi (#)

Fr.: phonologie   

A branch of linguistics that studies the rules in any given language that govern how → phonemes are combined to create meaningful words. Phonology and → phonetics study two different aspects of sound, but the concepts are dependent on each other in the creation of language.

phono-; → -logy.

phonon
  فونون   
fonon (#)

Fr.: phonon   

A quantum of vibrational or acoustic energy in a crystal lattice, being the analog of a photon of electromagnetic energy.

phono- + → -on.

phosphine
  فوسفین   
fosfin

Fr.: phosphine   

A colorless, flammable, and explosive gas at ambient temperature with unpleasant smell of rotten fish or garlic. Named also hydride of phosphorus (PH3), it is highly poisonous in nature. On cooling to 185.5 K, phosphine condenses to a liquid and on cooling to 139.5 K, it solidifies. By heating in the absence of air at 713 K or by passing an electric spark through it, phosphine breaks into its elements. Small amounts occur naturally from the break down of organic matter. It is heavier than air and slightly soluble in water. Phosphine is used in semiconductor and plastics industries, in the production of a flame retardant, and as a pesticide in stored grain. Phosphine has two strong absorption bands in → infrared at 10 and 9 μm.

From phosph-, variant of phospho-, denoting → phosphorus, used before a vowel + suffix -ine, ultimately from L. -inus, used to form names of chemical substances, especially basic (alkaline) substances, alkaloidal substances, or halogen elements.

phosphorescence
  فسفرستی   
fosforesti

Fr.: phosphorescence   

A specific type of → photoluminescence that continues for an appreciable time after the stimulating process has ceased. Phosphorescence is due to the existence of metastable → excited states of the atoms and molecules from which a change to the normal state is hindered for some reason or other. The change from the → metastable metastable state to the normal one becomes possible only as a result of some additional excitation, for example the application of heat.

phosphorus; → -escence.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con 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 Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>