-i·a·sis \ˈīəsə̇s\noun suffix (plural-i·a·ses \-ˌsēz\) Etymology: New Latin, from Latin, from Greek, suffix of action, from verbs in -ian, -iazein (from nouns in -ia -y) + -sis : morbid state or condition : disease having characteristics of (something specified) < elephantiasis > < satyriasis > : disease produced by (something specified) < ancylostomiasis > < habronemiasis >