Definitions (by source)
Aithdioghluim Dána: A Miscellany of Irish Bardic Poetry, Historical and Religious, including the Historical Poems of the Duanaire in the Yellow Book of Lecan. Vol II, Translations, Notes, Vocabulary
[N. 39] bearna [N. 4] gap, field of battle; ds. a mbeirn 528, a mberna 1232.
Duanaire Mhéig Uidhir: The poembook of Cú Chonnacht Mág Uidhir, Lord of Fermanagh 1566-1589. Editor: David Greene. Translator: David Greene.
a gap; like áth, ‘ford’, often used in transferred sense of ‘contest’, 395, 654, 659, 663, 671, 690, 691, 838, 1661, 1788, 1838
Poems on the O'Reillys. Editor: James Carney.
bearn (39), bearna (4), ón bheirn from fight 2609; i mbearna in strait 2765; ar bhearnaidh, ar an mbearnaidh in danger 3981, 3988.
The Book of O'Hara: Leabhar Í Eadhra. Editor: Lambert McKenna S.J.
f., gap, dat. beirn, 6180; dat. pl. bearnaibh, 2358; as n-stem bearna, 2650; gen. bearnan, 2652; dat. –nain, 10996; b. bhaoghail, ‘gap of danger,’ 2650
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.