An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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subcritical mass
  جرم ِ زیر-پرژنی  
jerm-e zir-paržani
Fr.: masse sous-critique  

An amount of → fissile material that by its mass or geometry is incapable of sustaining a → fission → chain reaction.

See also: → subcritical; → mass.