An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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petro-
  سنگ-  
sang- (#)
Fr.: petro-  

A combining form meaning “rock,” “stone.” Also, petri-, and petr- when before a vowel.

Etymology (EN): From Gk. petro-, combining form of petra “rock.”

Etymology (PE): Sang “rock,” → stone.