- tànaiste
- next heir, tanist, anything second, Irish tánaiste, lieutenant, second in command, heir apparent, Old Irish tánaise, secundus, imthanu, alternation, innimthána, talionem: *to-atn-, root at of ath, "re", Sanskrit at, also *at-s-men, of àm, time, q.v. (Strachan). Rhys (Celt.Breton$$+2, 308) suggests connection with Welsh tan, till, Latin tenus, root ten (no root tân?).
Etymological dictionary of the Gaelic language. Alexander Gairm Publications. 1982.