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Webster 1913 Edition

Noun.

[LL.

trentale

, fr. L.

triginta

thirty; akin to

tres

three: cf. OF.

trentel

. See

, and cf.

(R. C. Ch.)

An office and mass for the dead on the thirtieth day after death or burial.

“Their trentals and their shrifts.”

Spenser.

Hence, a dirge; an elegy.

trental ‎(plural trentals)

A Roman Catholic office and mass for the dead on the thirtieth day after death or burial.
Their trentals and their shrifts. — Spenser.
(by extension) A dirge or elegy.