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: 13176 Search : in
permutation
  پرموتش، جایگشت   
permuteš, jâygašt

Fr.: permutation   

Math.: A rearrangement of the elements of a set in a particular order. The number of permutations of n objects is equal to n! (→ factorial n). For example, there are 24 permutations of letters A, B, C, and D (4! = 1 × 2 × 3 × 4). The number of permutations of n objects taken r at a time is denoted by nPr and equals n! / (n - r)!. For example, the number of permutation of A, B, C, and D taken two at a time is 12. If n objects are of k different kinds, with r1 alike of one kind, permutations of n objects equals n! / r1! r2! ... rk!, where r1 + r2 + ... rk = n.

Verbal noun of → permute.

Permuteš, verbal noun of → permute.
Jâygašt , from "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") + gašt past tense of gaštan, gardidan "to turn, to change" (Mid.Pers. vartitan; Av. varət- "to turn, revolve;" Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend").

permute
  پرموتیدن   
permutidan

Fr.: permuter   

M.E., from L. permutare "to change throughout," from per- "through" + mutare "to change," from PIE base *mei- "to change, go, move;" cf. Av. miθô "inverted, false," miθaoxta- "wrong spoken;" Skt. methati "changes, alternates, joins, meets," mith- "to alternate, meet," mithás "opposite, in opposition;" L. meare "to go, pass," mutuus "done in exchange;" Goth. maidjan "to change;" E. prefix mis- (in mistake).

Permutidan, from permute, as above.

perpendicular
  پالار   
pâlâr

Fr.: perpendiculaire   

A line or plane at right angles to another line or plane. Two curves are said to be perpendicular if their tangent lines are mutually perpendicular. → normal; → vertical

From M.E. perpendiculer(e), from O.Fr. perpendiculiere, from L. perpendicularis "vertical, as a plumb line," from perpendiculum "plumb line," from perpendere "balance carefully," from per- "thoroughly" + pendere "to weigh, to hang."

Pâlâr "pillar, column, main beam."

perpendicular axis theorem
  فربین ِ آسه‌ها‌ی ِ پالار   
farbin-e âsehâ-ye pâlâr

Fr.: théorème des axes perpendiculaires   

The → moment of inertia of a plane object (→ lamina) about an axis perpendicular to the plane is equal to the sum of the moments of inertia about any two perpendicular axes in the plane. Thus if x and y axes are in the plane, Iz = Ix + Iy.

perpendicular; → axis; → theorem.

perpetual
  همیشگی   
hamišegi (#)

Fr.: perpétuel   

Lasting an indefinitely long time; eternal; permanent. → perpetual motion; → perpetual calendar.

M.E. perpetuall, from O.Fr. perpetuel, from L. perpetualis "permanent," from perpetuus "continuous, universal," from perpetis, genitive of Old L. perpes "lasting;"

Hamišegi from hamišé "always;" Mid.Pers. hamišag, from anôšag "immortal," from Av. an-aoša-, from negation prefix → an- + aošah- "death; ruin; corruption" (Mid.Pers. hôš "death;" Mod.Pers. hôš, huš "death; mind; intellect"); cf. derivatives Sogd. nôšé "immortal," nôšak "always;" Mod.Pers. nôš, nuš "the water of immortality; sweet; honey."

perpetual calendar
  گاهشمار ِ همیشگی   
gâhšomâr-e hamišegi

Fr.: calendrier perpétuel   

A chart or mechanical device that indicates the day of the week for any given date over a period of many years.

perpetual; → calendar.

perpetual motion
  جنبش ِ همیشگی   
jonbeš-e hamišegi

Fr.: mouvement perpétuel   

The motion of a hypothetical machine which, once set in motion, will go on for ever without any losses due to → friction or other forms of → dissipation of energy and without receiving any external energy.

perpetual; → motion.

Perseids
  پرسءوسیان   
Perseusiyân

Fr.: Perséides   

A → meteor shower, one of the three most active of the year, which occurs between July 25 and August 20 with the greatest activity between August 8 and 14, peaking about August 12. The Perseids appear as the Earth's orbit around the → Sun crosses the dusty tail of the comet → Swift-Tuttle, as first explained by Giovanni Schiaparelli (1835-1910), an Italian astronomer. Usually about 50 meteors can be seen per hour, but in outburst years (such as in 2016) the rate can be between 150-200 meteors an hour.

Perseus + -ids.

Perseus
  پرسءوس   
Perseus (#)

Fr.: Persée   

The Hero. A rich constellation in the northern hemisphere between → Auriga and → Cassiopeia, at 3h 20m right ascension, 45° north declination. Beta (β) Persei, or → Algol, is a famous → eclipsing binary star. Abbreviation: Per; genitive: Persei.

The most celebrated of the Greek heroes, the son of Zeus and Danae, who slew the Gorgon Medusa, and afterward saved Andromeda from a sea monster.

Perseus, from Gk., as above, instead of the Arabicized form Barsâvuš (برساووش).

Perseus A
  پرسءوس A   
Persus A

Fr.: Perseus A   

A → radio source in the constellation → Perseus, identified with the supergiant elliptical galaxy → NGC 1275.

Persus.

Perseus Arm
  بازوی ِ پرسءوس   
bâzu-ye Perseus

Fr.: Bras de Persée   

One of the spiral arms of the Galaxy. It is about 5000 light-years farther from the center than the local Orion Arm, in which the Sun lies.

Persus; → arm.

Perseus Cluster
  خوشه‌ی ِ پرسءوس   
xuše-ye Perseus

Fr.: amas de Persée   

A → galaxy cluster of about 12,000 members about 250 million → light-years (→ redshift z = 0.0176) away, covering 4° of sky in the constellation → Perseus. It is dominated by elliptical galaxies. At its center lies the → radio sourcePerseus A. Also known as Abell 426 (→ Abell catalog).

Perseus; → cluster.

Perseus-Pisces supercluster
  ابرخوشه‌ی ِ پرسءوس-ماهی   
abarxuše-ye Perseus-Mâhi

Fr.: superamas de Persée-Poissons   

A long, dense chain of galaxies with a length of almost 300 million → light-years, constituting one of the largest known structures in the → Universe. At the left end of the supercluster lies the massive → Perseus cluster (A426), one of the most massive clusters of galaxies within 500 million light-years.

Perseus; → Pisces; → cluster.

Persian calendar
  گاهشمار ِ ایرانی   
gâhšomâr-e Irâni (#)

Fr.: calendrier persan   

Same as → Iranian calendar.

Persian, adj. of Persia, from O.Pers. Pārsa.

Irâni adj. of Irân, from Mid.Pers. Êrân "(land of) the Aryans," pluriel of êr "noble, hero," êrîh "nobility, good conduct;" Parthian Mid.Pers. aryân; O.Pers. ariya- "Aryan;" Av. airya- "Aryan;" cf. Skt. ārya- "noble, honorable, respectable."

persist
  پریستادن   
paristâdan

Fr.: persister   

1) To continue steadfastly or firmly in some state, purpose, course of action, or the like, especially in spite of opposition, remonstrance, etc.
2) To last or endure tenaciously (Dictionary.com).

M.Fr. persister, from L. persistere "abide, continue steadfastly," from → per- "thoroughly" + sistere "come to stand, cause to stand still," → resist.

Paristâdan from par-, → per-, + istâdan "to stand," → resist.

persistence
  پریست   
parist

Fr.: persistance   

The act or fact of persisting; the quality of being persistent.

Verbal noun from → persist.

persistent
  پریستنده   
paristandé

Fr.: persistant   

Persisting, especially in spite of opposition, obstacles, discouragement, etc.; persevering (Dictionary.com).

Adjective from → persist.

person
  تنوم   
tanum

Fr.: personne   

1) A human being, whether man, woman, or child as distinguished from an animal or a thing.
2) Philosophy: A self-conscious or rational being.
3) Grammar: Any one of three forms of verbs and pronouns used to denote the speaker, the person addressed, or somebody else being referred to.
4) Law: A living human being or a group, either or both having legal rights and responsibilities.
See also:
personal, → personal equation, → personality.

M.E. persone, from O.Fr. persone "human being," from L. persona "human being," originally "character in a drama, mask," possibly borrowed from Etruscan phersu "mask," from Gk. prosopa "face; mask" + -na a suffix.

Tanum, from O.Pers. and Av., related to Mod./Mid.Pers. tan "body, person," O.Pers. tanūš "body," tanūm [acc.sg.] "(to) onself;" Av. tanū- "body, person, self," tanūm [acc.sg.]; cf. Skt. tanūš- "body, self;" PIE base *ten-uh- "body."

personage
  تنومسا   
tanumsâ

Fr.: personnage   

1) A person of distinction or importance.
2) A dramatic, historical, or fictional → character in a play, story, etc.

M.E. "form, appearance, stature, figure, air, and the like, of a person," from O.Fr. personage "size, stature; a dignitary," from M.L. personagium, from persona, → person.

Tanumsâ, from tanum, → person, + -sâ, contraction of -âsâ, suffix of "form, type, similarity."

personal
  تنومی   
tanumi

Fr.: personnel   

Of or pertaining to a particular person; individual; private. → personal equation.

person; → -al.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB 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 con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def 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 Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc 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 ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl 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 > >>