reithim
Definitions (by source)
[EC rioth] Fut. reithfead; Sbj. reithear; Pf. 3. do reith. do ré (cf. DD v. 6).
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. Editor: Lambert McKenna S.J.