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
pyro-
  آذر-   
âzar-

Fr.: pyro-   

A prefix meaning "fire, heat, high temperature," used in the formation of compound words. → pyrheliometer; → pyrometer.

From Gk. pyro-, combining form of pyr "fire," cognate with O.E. fyr, O.N. fürr, M.Du. vuur, Ger. Feuer), from PIE *paewr-; cf. Mod.Pers. Lori porpor "blazing charcoal," Gilaki bur, biur "smokeless red fire" (Lori perisk, periska "spark," Kurd. biriske "spark," Lârestâni pelita "spark"); Gk. pyr "fire;" Hitt. pahhur "fire;" Skt. pū- "to cleanse."

&ACIRC;zar, variants âtaš, taš "fire," from Mid.Pers. âtaxš, âtur "fire;" Av. ātar-, āθr- "fire," singular nominative ātarš-; O.Pers. ātar- "fire;" Av. āθaurvan- "fire priest;" Skt. átharvan- "fire priest;" cf. L. ater "black" ("blackened by fire"); Arm. airem "burns;" Serb. vatra "fire;" PIE base *āter- "fire."

pyrometer
  آذر‌سنج   
âzarsanj (#)

Fr.: pyromètre   

A device used for measuring high temperatures. By comparing a source whose temperature is to be measured to a standardized source of illumination, it determines the temperature of the former source.

pyro- + → -meter.

pyroxene
  پیرکسن   
piroksen (#)

Fr.: pyroxène   

One of the major groups of silicate minerals found in many igneous and metamorphic rocks. Pyroxene minerals are also common in meteorites. There are many different types of pyroxene. All of the types contain Si2O6 but some have sodium (Na) while others have iron (Fe), magnesium (Mg), or a combination of these three elements.

From → pyro- "fire," + xeno- a combining form meaning "alien, strange, guest," from Gk. xenos "stranger, guest." Pyroxene was originally supposed to be a foreign substance when found in igneous rocks.

Pythagorean theorem
  فربین ِ پوتاگوراس، ~ فیساغورس   
farbin-e Pythagoras, ~ Fisâqures

Fr.: théorème de Pythagore   

The proposition that the → square of the → hypotenuse of a → right triangle is equal to the → sum of the squares of the other two sides: a2 + b2 = c2.

After Pythagoras (c570 BC-c495BC), Greek philosopher and mathematician; → theorem.

Pythagorean triple
  سه‌تایه‌ی ِ پوتاگوراس، ~ فیساغورس   
setâye-ye Pythagoras, ~ Fisâqures

Fr.: triplet de Phythagore   

Any group of three → integers that satisfy the relations specified by the → Pythagorean theorem. Some examples: 3, 4, and 5; 5, 12, and 13; 8, 15, 17.

Pythagorean theorem; → triple; → triplet.

Pyxis
  قطب-نما   
qotb-namâ (#)

Fr.: Boussole   

The Compass Box. A faint constellation in the southern hemisphere, at 9h right ascension, 30° south declination, representing a mariner's compass. Its brightest star, Alpha Pyxidis, is magnitude 3.7. Abbreviation: Pyx; genitive: Pyxidis.

L. pyxis, from Gk. pyxis "box."

Qotbnamâ literally "pole indicator," from qotb, → pole, + namâ "displayer, indicator," from nemudan "to show" (Mid.Pers. nimūdan, nimây- "to show," from O.Pers./Av. ni- "down; into" (Skt. ni "down," nitaram "downward," Gk. neiothen "from below," cf. E. nether, O.E. niþera, neoþera "down, downward, below, beneath," from P.Gmc. *nitheraz, Du. neder, Ger. nieder; PIE *ni- "down, below") + māy- "to measure;" cf. Skt. mati "measures," matra- "measure;" Gk. metron "measure;" L. metrum; PIE base *me- "to measure").

<< < -ph pal par par par par pas Pau pen per per per per Per per pha Pho pho pho pho Pia Pis Pla pla pla pla Ple Pog pol pol pol pol pop pos pot Poy pre pre pre pre pri pri pro pro pro pro pro pro pro pub pul pyr > >>