Eág-þyrl

According to the Old English Dictionary:

ég-þyrl, éh-þyrl, es;

eág-þyrl

n. An eye-hole, a window; fenestra :-- Ontýnde se bisceop ðaet eág-þyrl ðære cyricean apĕruit episcŏpus fenestram oratōrii, Bd. 4, 3; S. 568, 6: 5, 12; S. 629, 15. eag-þyrl