sionnach
Definitions (by source)
a fox. geall re sionnach a chroiceann, 'the pelt is as good as the whole fox', apparently proverbial, 2140.
Poems on the O'Reillys. Editor: James Carney.
m., fox;--pl. dat. sionnchaibh, 8119
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.