An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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two
  دو  
do (#)
Fr.: deux  

A cardinal number, 1 plus 1. → two-color diagram; → two-photon emission.

Etymology (EN): M.E., from O.E. twa, feminine and neuter form of twegen “two,” from P.Gmc. *twai (cf. O.S., O.Fris. twene, twa, O.N. tveir tvau, Du. twee, O.H.G. zwene, zwo, Ger. zwei, Goth. twai), cognate with Pers. do, as below.

Etymology (PE): Do “two,” from Mid.Pers. do; Av. dva-; cf.
Skt. dvi-; Gk. duo; L. duo (Fr. deux), di;
Lith. dvi; O.C.S. duva; PIE base *duwo.