Word-A-Week in Indo-European
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Today's Word: *mer-, *mor-, *mrto-
Translation:  death, dead, to die
Related to: Greek emorten (died), marainw (I destroy)
  Latin morior (I die), mortuus (dead), morbus (disease) - last very probable 
Sardinian morrere, morri (to die), French mourir, Occitan mouri, Spanish morir, Catalan morirse, Italian morire, Ladin morir, smurir, Romanian muri, Aromunian muri (he died), Portuguese morrer
  Common Celtic *mr@- (to die), *marvos (dead), 
Gaulish marvos, Old Irish marb, Irish marbh,  Welsh marw, Cornish marow, Breton maro
  Common Germanic *mur-thra- (murder), 
Gothic maurthr (murder), Old English morthor, German Mord, English murder, Dutch moord, Frisian moard
  Avestan miryeite (dies), 
Pushtu mrel (to die), Baluchi murtha, miragh, Wakhi meri-, Ossetic maelyn - strange mutation, maybe not a relative, Tadjik murdan, Persian mordan (to die), mordeh (dead)
  Sanskrit marati (dies), 
Punjabi merna (to die), Gypsy merav, Lahnda meren, Nepali marnu, Kashmiri marun, Singalese marenawa, Gujarati merwu, Hindi merna, Bengali mora, Marathi merne
Armenian meranim (I die)
Lydian mru-, mruvaa (a stele) - was put on burial stones, therefore the analogue; but not for sure
  Common Baltic *mir- / *mer- (to die), 
Lithuanian mirti, Latvian mirt
  Slavic *merti (to die), 
Ukrainian mereti, mru (I die), Belorussian mertsi, Bulgarian mra (I die), Macedonian umram (I die), Serbo-Croatian mrijeti (to die), Slovene mreti, Czech miti, Slovak mret', mrem (I die), Polish mr (I die), Upper Sorbian mec' (to die), Russian umeret' (to die)
Notes: A very wide-spread stem, and a simple meaning allowed it to have traces practically in all Indo-European languages. This stem was very productive, and in Slavic even became a name for a death goddess Mara. There are different versions about where this stem came from, but they are all too dissimilar with the truth. 
Maybe English to mourn with its analogues in many Germanic languages is also a cognate.
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