An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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ultracool dwarf
  کوتوله‌ی ِ اولترسرد  
kutule-ye ultarsard
Fr.: naine ultrafroide  

A star-like objects with an → effective temperature of less than 2,700 K. Ultracool dwarfs constitute a heterogeneous group including stars of extremely low mass as well as → brown dwarfs, and represent about 15% of the population of astronomical objects near the Sun.

See also: → ultra-; → cool; → dwarf.