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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Number of Results: 5 Search : subtract
sky subtraction
  زیرکرشش ِ آسمان   
zirkaršeš-e âsmân

Fr.: soustraction de ciel   

The act or instance of removing the contribution of non-related, intervening foreground light to the object.

sky; → subtraction.

subtract
  زیرکرشیدن، کاهیدن   
zirkaršidan, kâhidan

Fr.: soustraire   

To take one number away from another; deduct. To perform the arithmetic operation of → subtraction.

From L. subtractus, p.p. of subtrahere "to draw from beneath, take away, draw off," from → sub- "from under" + trahere "to pull, draw."

Zirkaršidan, literally "to draw beneath," from zir-, → sub-, + karšidan "to draw, pul, drag," variant of kašidan "to draw, protract, trail, drag, carry;" Av. karš- "to draw; to plow," karša- "furrow;" Proto-Iranian *kerš-/*xrah- "to draw, plow;" cf. Skt. kars-, kársati "to pull, drag, plow;" Gk. pelo, pelomai "to move, to bustle;" PIE base kwels- "to plow."
Kâhidan, → decrease.

subtraction
  زیرکرشش   
zirkaršeš

Fr.: soustraction   

The operation of finding the difference between two numbers or quantities.

Verbal noun of → subtract.

subtractive
  زیرکرششی   
zirkaršeši

Fr.: soustractif   

1) Constituting or involving → subtraction.
2) Math.: Indicating or requiring subtraction; having a → minus sign.

subtract; → -ive.

subtractive color
  رنگ ِ زیرکرششی   
rang-e zirkaršeši

Fr.: synthèse soustractive   

Color produced by mixing pigments rather than light. Mixing all of the subtractive colors together results in the color black. See also → additive color.

subtractive; → color.