An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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irregular galaxy
  کهکشان ِ بی‌سامان  
kahkašân-e bisâmân
Fr.: galaxie irrégulière  

A galaxy with no spiral structure and no symmetric shape. Irregular galaxies are usually filamentary or very clumpy in shape and
tend to smaller than others. Two types of irregular galaxies are defined, → Irr I galaxy and → Irr II galaxy.

See also: → irregular; → galaxy.