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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atomic mass number (A-number)
  عدد ِ جرم ِ اتمی   
adad-e jerm-e atomi (#)

Fr.: nombre de masse atomique   

The total number of → protons and → neutrons in the → nucleus of an → atom (symbol A). For example, Oxygen-16 has a mass number of sixteen, because it has eight protons and eight neutrons.

atomic; → mass; → number.

atomic mass unit (amu)
  یکای ِ جرم ِ اتمی   
yekâ-ye jerm-e atomi (#)

Fr.: unité de masse atomique   

A unit of mass used for atoms and molecules, equal to 1/12 of the mass of an atom of carbon-12 (including orbital electrons). It is equal to 1.660 33 × 10-24 g.

atomic; → mass; → unit.

atomic nucleus
  هسته‌ی ِ اتم   
haste-ye atom (#)

Fr.: noyau atomique   

The central part of the → atom. It is made up of → protons and, in most cases, → neutrons. The nucleus is surrounded by a swarm of fast-moving → electrons. Almost all of the mass (more than 99%) of an atom is contained in the dense nucleus. The number of protons in the nucleus (called → atomic number) determines the type of → chemical element. Atoms that differ only in the number of neutrons in their nuclei are called → isotopes.

atomic; → nucleus.

atomic number
  عدد ِ اتمی   
adad-e atomi (#)

Fr.: nombre atomique   

The number of → protons in an → atomic nucleus (symbol Z). Same as → Z-number. The atomic number is written as a subscript to the left of the → chemical element name. For example, the most common isotope of oxygen is shown as 816O, which has 8 → protons and its → mass number (A) is 16.

atomic; → number.

atomic proposition
  گزاره‌ی ِ اتمی   
gozâre-ye atomi

Fr.: proposition atomique   

In → propositional logic, a → sentence without any → connectives. See also → molecular proposition.

atomic; → proposition.

atomic time
  زمان ِ اتمی   
zamân-e atomi (#)

Fr.: temps atomique   

Time measured using atomic clocks.

atomic; → number.

atomic transition
  گذرش ِ اتمی   
gozareš-e atomi

Fr.: transition atomique   

A change in the → energy level or → state of an → atom in which a → quantum of energy is either gained or lost. See also → forbidden transition; → permitted transition; → semiforbidden transition.

atomic; → transition.

atomic volume
  گنج ِ اتمی   
gonj-e atomi

Fr.: volume atomique   

The volume one → mole of a → chemical element occupies at room temperature. Atomic volume is typically given in cubic centimeters per mole (cc/mol). In other words, atomic volume is the ratio of → atomic mass to the → density of an element.

atomic; → volume. .

atomic volume curve
  خم ِ گنج ِ اتمی   
xam-e gonj-e atomi

Fr.: courbe du volume atomique   

A graph displaying → atomic volumes of → chemical elements against their → atomic masses, first plotted by Lother Meyer (1830-1895). The elements with similar properties occupy the same positions on the graph. In the original curve, Lothar Meyer plotted atomic volumes against → atomic weights. → Alkali metals such as Na, K, Rb, and Cs occupy the top position on the graph. Elements like Be, Mg, Ca, Sr, and Ba occupy the positions on the ascending part of the graph. → Inert gases, except He, occupy the positions on the descending part of the graph. → Halogen elements like F, Cl, and Br also occupy the descending part of the graph.

atomic; → volume; → curve.

atomic weight
  وزن ِ اتمی   
vazn-e atomi (#)

Fr.: poids atomique   

relative atomic mass.

atomic; → weight.

atomic wff
   wff اتمی   
wff atomi

Fr.: FBF atomique   

i) If t1, t2, ..., tn are terms and P is a → predicate of arity n, then P(t1, t2, ..., tn) is an atomic wff.
ii) If t1 and t2 are terms, then (t1 = t2) is an atomic wff.

atomic; → wff.

attack
  ۱) پتاک؛ ۲) پتاکیدن   
1) patâk; 2) patâkidan

Fr.: 1) attaque; 2) attaquer   

1a) An aggressive and violent act against a person or place.
1b) Chem.: The beginning of a series of destructive reactions.
2a) To apply aggressive military action against (a place or enemy forces).
2b) Chem.: To begin a destructive reaction by breaking a bond or forming a new bond.

From M.Fr. attaquer, from Florentine Italian attaccare (battaglia) "join (battle)."

Patâk, from pa-, short for pati- "contrary, opposite" (az in panâh, padid), → against, + tâk, variants tak, tag, tâz "rush, running, attack," related to tâxtan "to run; to hasten; to assault," → flow.

attend
  آتانیدن   
âtânidan

Fr.: attendre   

1) To pay attention.
2) To be present at.

M.E. atenden, from O.Fr. atendre "to expect, wait for, pay attention," from L. attendere "give heed to," literally "to stretch toward," from → ad- "to" + tendere "stretch," → tension.

Âtânidan, from prefix â- + tân, from tan-, tanidan "to spin, twist, weave" (cf. tân "thread, warp of a web," variants târ "thread, warp, string," tâl "thread" (Borujerdi dialect), tur "fishing net, net, snare"); Mid.Pers. tanitan; Av. tan- to stretch, extend;" cf. Skt. tan- to stretch, extend;" tanoti "stretches," tantram "loom;" tántra- "warp; essence, main point;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch;" Lith. tiñklas "net, fishing net, snare;" PIE base *ten- "to stretch."

attendance
  ۱، ۲) آتانگری؛ ۲) آتانگران   
1, 2) âtângari; 2) âtângarân

Fr.: 1) service; 2) présence; 3) assistance   

1) The act or state of attending.
2) The act or state of going to or being present at a place or event.
3) The persons or number of persons present at a particular place or event.

attend; → -ance.

attendee
  آتانگر، پارگرتنده   
âtângar, pârgertandé

Fr.: participant   

A person who is present at a specific time or place.

From → attend + suffix -ee

Âtângar agent noun from → attend; pârgertandé agent noun from pârgertidan, → participate.

attention
  آتانش   
âtâneš

Fr.: attention   

1) The act or faculty of attending, especially by directing the mind to an object.
2) Observant care; consideration (Dictionary.com).

attend; → -tion.

attentive
  آتانمند   
âtânmand

Fr.: attentif   

1) Characterized by or giving attention; observant.
2) Thoughtful of others; considerate; polite; courteous (Dictionary.com).

attend; → -ive.

attenuate
  تنکیدن   
tonokidan (#)

Fr.: atténuer   

1) To reduce in force, value, amount, or degree. → attenuation, → attenuation factor.
2) To reduce the amplitude of an electrical signal with little or no distortion.

L. attenuatus, p.p. of attenuare "to make thin," from → ad- "to" + tenuare "make thin," from tenuis "thin;" cf. Gk. tanaos "thin, slender, elongated;" Skt. tanuka-, tanu- "thin;" Av. tan- "to stretch;" Pers. tonok "thin," as below; O.Ir. tanae "delicate, thin;" O.H.G. dunni "thin."

Tonokidan, from tonok "thin, slender, slight, tender, delicate" + -idan, infinitive suffix. Tonok, from Mid.Pers. tanuk, Av. root tan- "to stretch, extend," cognate with L. tenuis, as above.

attenuation
  تنکش   
tonokeš (#)

Fr.: atténuation   

The falling off of the energy density of radiation with distance from the source, or with passage through an absorbing or scattering medium.

Verbal noun of → attenuate.

attenuation coefficient
  همگر ِ تنکش   
hamgar-e tonokeš

Fr.: coefficient d'bsorption   

The fraction of a beam of → X-rays or → gamma rays that is absorbed or scattered per unit thickness of the → absorber. The linear attenuation coefficient, denoted by the symbol μ, appears in the equation I(x) = I0ex, where I(x) is the intensity at depth of x cm and I0 is the original intensity.

attenuation; → coefficient.

<< < -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 > >>