\Tren"tal\, n. [LL. trentale, fr. L. triginta thirty;
akin to tres three: cf. OF. trentel. See {Three}, and cf.
{Trigintal}.]
1. (R. C. Ch.) An office and mass for the dead on the
   thirtieth day after death or burial. ``Their trentals and
   their shrifts.'' --Spenser.
2. Hence, a dirge; an elegy.