An Etymological Dictionary of the German Language/satt
satt, adj., ‘sated, satiated,’ from the equiv. MidHG. and OHG. sat (gen. sates), adj.; corresponding to the equiv. OSax. sad, AS. sœd, ‘sated’ (E. sad), OIc. saðr (saddr), Goth. saþs, ‘sated.’ A Teut. partic., in -da- (see laut and falt) connected with an Aryan root sā̆, ‘to satiate,’ from whose long vowel form Goth. sô-þjan, ‘to satisfy,’ and sô-þs, ‘repletion,’ are constructed. Comp. Lat. sat, satis, satur; Lith. sōtas, m., ‘repletion,’ sōtus, ‘satiating, easily satiated’; Gr. ἄμεναι (ā), ‘to satiate,’ ἄ-ατος, ‘insatiable,’ and ἄ-δην, ‘sufficiently’; OIr. sathach, ‘sated,’ súsaim, ‘to sate, satiate,’ sáith, ‘repletion’ (OSlov. sytŭ, ‘sated,’ is, on account of its vowel, not allied). The meaning of E. sad is curiously developed from the idea expressed by satt.