Tripla

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

tripla

(að), v. to chant in three voices (hvárki t. eða tvísyngja).

Possible runic inscription in Younger Futhark:ᛏᚱᛁᛒᛚᛅ

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norwegian - Johan Fritzner's Dictionary