Gjalla

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

gjalla

(gell; gall, gullum; gollit), v. to scream, shriek (ernir ~ hátt); strengr gellr, the bow-string twangs; impers. to resound, echo (kvað Þorsteinn svá hátt, at gall í múrnum).

Possible runic inscription in Younger Futhark:ᚴᛁᛅᛚᛚᛅ

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