An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1 Search : imaginary number
imaginary number
  عدد ِ پنداشتی   
adad-e pendâšti (#)

Fr.: nombre imaginaire   

A number that is or can be expressed as the square root of a negative number; thus √ -1 is an imaginary number, denoted by i; i2 = - 1.

M.E. imaginary from L. imaginarius, from imagin-, stem of imago, → image, + -arius "-ary;" → number.

Adad, → number; pendâšti, adj. of pendâšt, pendâštan "to imagine, consider, think," from Mid.Pers. pad êd dâštan "to consider," from pad "to, at, in, on" + êd "this" + dâštan "to have, hold, keep" (Mod.Pers. dâštan); O.Pers./Av. root dar- "to hold, keep back, maintain, keep in mind;" Skt. dhar- "to hold, keep, preserve," dharma- "law;" Gk. thronos "elevated seat, throne;" L. firmus "firm, stable;" Lith. daryti "to make;" PIE base *dher- "to hold, support."