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: 68 Search : cation
magnification
  بزرگنمایی   
bozorgnamâyi (#)

Fr.: magnification   

The factor by which the angular diameter of an object is apparently increased when viewed through an optical instrument to that of the object viewed by the unaided eye.

Verbal noun of → magnify.

modification
  واترز، واترزش   
vâtarz, vâtarzeš

Fr.: modification   

An act or instance of modifying; the state of being modified; partial alteration.

Verbal noun of → modify.

Morgan-Keenan classification
  رده‌بندی ِ مورگان-کینان   
radebandi-ye Morgan-Keenan (#)

Fr.: classification de Morgan-Keenan   

A system of → spectral classification introduced in 1943 by William W. Morgan (1906-1994), Philip C. Keenan (1908-2000), and Edith M. Kellman (1911-2007) at Yerkes Observatory. Also known as the MK (or MKK) classification or the → Yerkes system.

Named after the two main astronomers, as above; → classification.

morphological classification
  رده‌بندی ِ ریخت‌شناختی   
radebandi-ye rixtšenâxti (#)

Fr.: classification morphologique   

A classification scheme of galaxies based on their apparent shape. → Hubble classification.

morphological; → classification.

multiplication
  بستایش   
bastâyeš

Fr.: multiplication   

In general, the process of repeatedly adding a quantity to itself a certain number of times, or any other process which has the same result.

Verbal noun of → multiply.

multiplication sign
  نشانه‌ی ِ بستایش   
nešâne-ye bastâyeš

Fr.: croix de multiplication   

The sign used to indicate multiplication, either a times sign (×), a centered dot (·), or an asterisk. The multiplication sign was introduced by William Oughtred in 1631.

multiplication; → sign.

mystification
  شاردش   
šârdeš

Fr.: mystification   

The act of mystifying or the condition of being mystified.

mystify; → -tion.

nested multiplication
  بستایش ِ تو-در-تو   
bastâyeš-e tu-dar-tu

Fr.: multiplication imbriquée   

A method in the evaluation of polynomials which involves fewer basic operations and allows simpler computation, especially for polynomials of high degree. More specifically, the polynomial P(x) = a0 + a1x + a2x2 + a3x3 + ... + anxn can be written in the nested form as: P(x) = a0 + x(a1 + x(a2 + ... + x(an - 1 + anx) ...)). For example, the polynomial P(x) = x3 - 5x2 + 10x - 3 has the following nested form: P(x) = ((x - 5)x + 10)x - 3. Same as the → Ruffini-Horner method.

nested; → multiplication.

personification
  تنومارش   
tanumâreš

Fr.: personnification   

1) The attribution of human nature or character to animals, inanimate objects, or abstract notions, especially as a rhetorical figure.
2) The representation of a thing or abstraction in the form of a person, as in art.
3) The person or thing embodying a quality or the like; an embodiment or incarnation (Dictionary.com).

Verbal noun of → personify.

provocation
  فراوچ   
farâvac

Fr.: provocation   

1) The act of provoking.
2) Something that → incites, → instigates, angers, or irritates (Dictionary.com).

Verbal noun of → provoke.

publication
  واگانش   
vâgâneš

Fr.: publication   

1) The act of publishing a book, periodical, map, piece of music, engraving, or the like.
2) The act of bringing before the public; announcement.
3) The state or fact of being published (Dictionary.com).

Verbal noun of → publish.

qualification
  چونایش   
cunâyeš

Fr.: qualification   

1) A quality, accomplishment, etc., that fits a person for some function, office, or the like.
2) A circumstance or condition required by law or custom for getting, having, or exercising a right, holding an office, or the like.
3) The act of qualifying; state of being qualified (Dictionary.com).

qualify; → -tion.

quantification
  چندایش   
candâyeš

Fr.: quantification   

The fact or process of quantifying.

Verbal noun of → quantify.

rectification
  راستش   
râsteš

Fr.: rectification   

1) Math.: The process of determining the length of a curve.
2) Physics: Conversion of an alternating into a direct current.
3) Astro.: The process of rectifying a spectrum.

Verbal noun of → rectify.

revocation
  واوچ   
vâvac

Fr.: révocation   

The act of revoking; annulment.

Verbal noun of → revoke.

Secchi classification
  رده‌بندی ِ سکی   
radebandi-ye Secchi

Fr.: classification de Secchi   

A pioneering work in → spectral classification conducted in the 1860s. Secchi divided stars into four main groups based on the visual observation of spectra. Class I: The white and bluish stars with a continuous spectrum crossed by hydrogen bands, the metallic bands being absent or weak. Examples, → Sirius, → Vega. Class II: Yellow stars, with spectra in which the hydrogen bands were less prominent and the metallic lines more strong. Examples, Sun, → Capella. Class III: Red or orange stars, showing bands or flutings. Examples, → Antares, → Betelgeuse. Class IV: Red stars, showing bands similar to Class III, but with the sharp edge of the flutings toward the other end of the spectrum. Secchi's scheme was superseded by the photographic → Harvard classification system.

Pietro Angelo Secchi (1818-1878), Italian astronomer and Jesuit priest; → classification.

signification
  نشانارش   
nešânâreš

Fr.: signification   

1) Something that is signified, → meaning, sense.
2) The act of signifying. → significance, → significant, → level of significance.

Verbal noun of → signify.

simplification
  ساده‌کرد، ساده‌شد   
sâde-kard, sâde-šod

Fr.: simplification   

The act of simplifying, or the fact of being simplified.

Verbal noun of → simplify.

SMASS classification
  رده‌بندی ِ SMASS   
radebandi-ye SMASS

Fr.: classification SMASS   

An asteroid taxonomy built on the → Tholen classification but based on the presence or absence of → absorption features in the visible part of the spectrum. In many cases the two classifications are the same, but the Tholen C and S classes are subdivided in the SMASS classification.

SMASS stands for the Small Main-belt Asteroid Spectroscopic Survey, → small; → main belt; → asteroid; → spectroscopic; → survey; → classification.

solidification
  دفزش؛ دفزانش   
dafzeš; dafzâneš

Fr.: solidification   

1) To become or make solid, hard, or firm.

solid; → -fy.


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