出典:Wiktionary
Borrowed from Ancient Greek δέσῐς (désis, “binding together”), from δέω (déō, “to bind, tie, fasten”) + -σῐς (-sis, nominal suffix).
Terms derived from this suffix usually have two pronunciation alternatives, with a tendency that partially reflects the boundary of 英国発音 and Commonwealth English versus American English; the former tends toward /-ˈɒdɪsɪs/, and the latter also uses /-ˈɒdɪsɪs/ for some terms but usually uses /-oʊˈdiːsɪs/ for some others.