An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Quaternary period
  دوران ِ چهارم  
dowrân-e cahârom
Fr.: quaternaire  

The last two million years of geologic time, comprising the Pleistocene and Holocene glacial epochs. Estimates of the date of the beginning of the Quaternary vary between 2.5 and 1.6 million years ago.

Etymology (EN): Quaternary, from L. quaternarius “consisting of four,” from quatern(i) “fourt at a time” + -arius “-ary;” → period.

Etymology (PE): Dowrân, → period; cahârom “fourth,” from cahâr “four” + -om “-th.”