Where does “Mutterschwester” come from?

Mutterschwester (German) comes from German mutter, from Middle High German muoter, from Old High German muoter, from Old Frisian mōder, from Proto-Germanic mōdēr, from Proto-Indo-European méh₂tēr — mother.

Mutterschwester (German): maternal aunt

Definitions

maternal aunt

Ancestry of “Mutterschwester”, step by step

Mutterschwester traces back through two separate lines of ancestry.

via German mutter

Step	Language	Word	Meaning
1	German	mutter	mother
2	Middle High German	muoter	mother
3	Old High German	muoter	mother
4	Old Frisian	mōder	—
5	Proto-Germanic	mōdēr	mother
6	Proto-Indo-European	méh₂tēr	mother

via German schwester

Step	Language	Word	Meaning
1	German	schwester	sister
2	Middle High German	swëster	—
3	Old High German	swester	sister
4	Proto-West Germanic	*swester	sister

Every word from Proto-Indo-European méh₂tēr →Every word from Proto-Germanic mōdēr →Every word from Old Frisian mōder →