ceachtar
Definitions (by source)
one or other (of two), 713, 3443, 4573.
Desiderius, otherwise called Sgáthán an Chrábhaidh. Editor: Thomas F. O’Rahilly.
one or other (of two or more); either, any one (of them), 988, 1049, 3161, 5424
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.