Word-A-Week in Indo-European
 
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Today's Word: *reg'-
   
Translation:  to rule, to lead straight, to put right
   
Related to: Greek rhx (a king) - a Middle Greek word borrowed from Latin in Medieval epoch, also rhgas
  Latin regere (to rule), rex (a king, a leader) 
        rectus (right, correct)
  Common Celtic *réks, gen. *régos (a king) > Old Irish (a king), Scottish Gaelic righ; indirect Irish -righ (right) 
Gaulish -rix (a king), pl. -riges - known from personal names including Vircingetorix
Welsh rhi (a king) - here r is lenited, Breton reizh (right, correct)
  Common Germanic *reik- (to rule) > Gothic reiks (a leader), Old English ríce (a kingdom), also -ríc (a king), ríce (rich, powerful); 
Old High German riche (kingdom), Old Norse and Old Swedish ríki (kingdom), Old Frankish ríke
          indirect: Old English riht (correct), Gothic raihts, Old High German recht, Old Swedish reht, Old Frankish riuht, Old Norse rettr
Modern: Swedish ratt, Danish ret, Icelandic rettr, German recht, Faroese raettur, Afrikaans reg, Dutch richten (to straighten out)
  Avestan raé (wealth, wealthy), raya (rich person) - a supposed word;
Persian rahst (right, correct)
  Sanskrit râj- (a king, a leader) - a proof of Proto-Indo-European -g'-
Thracian rhesus, resos, rézos (a personal name meaning "king")
  Baltic - not found
  Slavic: some linguists suggested Old Russian god Sva-rog, which is quite unnatural for Indo-European -g'- must have caused Slavic -z-; more reliable is Old Russian rez (profit) derived from the meaning "wealthy" of the same stem.
 
Notes: The first meaning of the word that is so spread in modern tongues, was "to lead right", "a leader" (Latin: Qualis rex, talix grex). That's why the meaning "right, correct" is much earlier than the other one "wealthy, rich" which was born from the wealth of kings. 
The words like English "direct" are also the derivatives, coming from Latin dis-rego into Spanish derecho, Potuguese direito, Rumanian drept, Ladin dret, Catalan dret, French direct
 
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