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: 6 Search : passive
passive
  اکار   
akâr

Fr.: passif   

Tending not to participate actively; not working or operating.

From L. passivus "submissive; capable of feeling or suffering," from passus, p.p. of pati "to experience, undergo, suffer."

Akâr "not working, not doing," from → a- negation prefix + kâr "work," varaint of kar, present stem of kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base kwer- "to do, to make").

passive cloud
  ابر ِ اکار   
abr-e akâr

Fr.: nuage passif   

A cumulus cloud that is no longer dynamically connected with the atmospheric boundary layer via updrafts or downdrafts.

passive; → cloud.

passive component
  همنه‌ی ِ اکار   
hamne-y akâr

Fr.: composante passive   

An electronic component which contains no source of power, in contrast to active components.

passive; → component.

passive galaxy
  کهکشان ِ اکار   
kahkešân-e akâr

Fr.: galaxie passive   

A galaxy lacking optical emission-line activity (e.g., [O II], Hα, [O III]) and showing only stellar absorption lines (e.g., the 4000 Å → calcium break, Mg I, Na I). Also called passively evolving galaxy.

passive; → galaxy.

passive system
  راژمان ِ اکار   
râžmân-e akâr

Fr.: système passif   

An electronic system which emits no energy, and is not detectable.

passive; → system.

passively evolving galaxy
  کهکشان با فرگشت ِ اکار   
kahkešân bâ fargašt-e akâr

Fr.: galaxie en évolution passive   

Same as → passive galaxy.

passive; → evolve; → galaxy.