Eahta-tyne
Bosworth & Toller Anglo-Saxon Old English Dictionary - eahta-tyne
According to the Old English Dictionary:
ehta-tyne;
- eahta-tyne
- adj. EIGHTEEN ; octōdĕcim :-- Híg him þeó-wodon eahtatyne geár they served him eighteen years, Jud. 3, 14: 10, 8. eahta-tyne