umlaut (the partial assimilation of vowels in some Germanic languages) · umlaut (diacritical mark)
çekim: çoğul umlauty · tamlayan umlautu
köken: Etymology tree German um- Proto-Indo-European *ḱlew- Proto-Indo-European *-tós Proto-Indo-European *ḱlutós Proto-Germanic *hlūdaz Proto-West Germanic *hlūd Old High German lūt Middle High German lūt German Laut German Umlautbor. Polish umlaut Borrowed from German Umlaut.
Any of the letters Å å, Ä ä or Ö ö, which are found in the Finnish alphabet, but not in the English one.
çekim: çoğul ääkköset · tamlayan ääkkösen
köken: Fronted from aakkonen (“letter”), such that it contains both ä and ö (two letters used in Finnish but not in English; å is only really used for Swedish names). Probably initially coined for around the 1980s-1990s, initially perhaps as a humorous term.