baisteadh
Definitions (by source)
m. ‘baptism’; dat. sg. 14.16; gen. sg, baisdigh 11.15, 48.12
Aibidil Gaoidheilge & Caiticiosma: Seaán Ó Cearnaigh's Irish primer of religion, published in 1571. Editor: Brian Ó Cuív.
m., act of baptizing, baptism, 2272; gen. –tidhe, 1991, 3326, 3341
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.