Krossmessa

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

krossmessa

f. Cross-mass, twice a year, in the spring (~ um várit), the 3rd of May, Invention of the Cross, and in autumn, the 14th of Sept., Elevation of the Cross.

Possible runic inscription in Younger Futhark:ᚴᚱᚢᛋᛋᛘᛁᛋᛋᛅ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary
• Old Norwegian - Johan Fritzner's Dictionary