Dies Irae
Concise Oxford English Dictionary © 2008 Oxford University Press:
Dies Irae /ˌdiːeɪz ˈɪərʌɪ, ˈɪəreɪ/
▶noun a Latin hymn sung in a Mass for the dead.
– origin L., ‘day of wrath’ (the opening words of the hymn).
'Dies Irae' also found in these Oxford entries:

