nanosizedEnglishOxford New American Dictionarynanosized /ˈnanōˌsīzd , ˈnænoʊˌsaɪzd / (also nanosize /ˈnanōˌsīz/) ▸ adjective having dimensions of only a few nanometers: the surface of a lotus leaf is dotted with nanosized wax particles nanosize diamonds have been discovered in the Greenland ice sheet.