Probably from Middle Low German böke, from Old Saxon bōka, or from eastern Middle Dutch boke, boeke, from Old Dutch *buoka. Not a 'native' Dutch word judging from the presence of a long umlauted vowel, which does not normally occur in Dutch. Both descend from Proto-Germanic *bōkijǭ.
Variant of buik.
- part of a church building, compare middenbeuk