From Old High German tou, from Proto-Germanic *dawwaz, from Proto-Indo-European *dʰew- (“run, flow”). Compare Low German Dau, Dutch dauw, English dew, compare also Danish dug.
Tau m (genitive Taus or Taues, no plural)
From Middle Low German, from Proto-Germanic *taugō. Cognate to Dutch touw and Danish tov.
Tau n (genitive Taus or Taues, plural Taue)
- strong rope
From Ancient Greek, see tau.
- tau (greek letter)