Þurh-lócung

According to the Old English Dictionary:

e;

þurh-lócung

f. A looking through or over, a preliminary examination(?) of a book; but the word glosses prohemium :-- Ðurhlócung prohemium, forespǽc praefatio, Wrt. Voc. i. 51, 38. [Cf. Illc an ferrs to þurrhlokenu offte, Orm. dedic. 68.] þurh-locung