keen 2 
(kēn)
(kēn)n.
A loud wailing or lament for the dead.
intr.v. keened, keen·ing, keens
To wail in lamentation, especially for the dead. See Synonyms at cry.
[From Irish Gaelic caoineadh, from caonim, I lament, from Old Irish caínim, coínim, perhaps of Brittonic origin.]
keener n.