An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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tetra-
  چهار-  
cahâr- (#)
Fr.: tétra-  

Combining form meaning four.

Etymology (EN): From Gk. tetra-, combining form of tettares, tessares “four,” cognate with Pers. cahâr, → four.