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Welsh word modryb comes from Proto-Indo-European *-tḗr, and later Proto-Celtic *mātīr (Mother.)
*-tḗr (Proto-Indo-European)
Derives agent nouns from verbs, denoting someone or something whose role or purpose it is to perform the verb's action.
*mh₂tros (Proto-Indo-European)
*mātīr (Proto-Celtic)
Mother.
*mātrikʷā (Proto-Celtic)
*mọdreb (Proto-Brythonic)
Aunt.
modryb (Welsh)
Aunt.