From Dutch-English Freedict Dictionary ver. 0.2: opper‐ /ˈɔpər/ arch‐, chief‐
opper‐ /ˈɔpər/ arch‐, chief‐
From Dutch-English Freedict Dictionary ver. 0.2: opper /ɔpər/ 1. haystack 2. heap, pile, stack
opper /ɔpər/ 1. haystack 2. heap, pile, stack