conc▪ Jeffery1938 presents two alternative suggestions (for details, see ↗sundus, section DISC): (a) via Pers sandūqus from Grk sánduks ‘bright red colour; (hence also:) transparent, flesh-coloured women’s garments (dyed with this colour)’, a word used among the Lydians; (b) from Grk sindṓn ‘garment used in the Bacchic mysteries’, Akk sudinnu, sadinnu.