Þverst

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

þverst

or later þvest, n. the lean flesh underneath the blubber of a whale.

Possible runic inscription in Younger Futhark:ᚦᚢᛁᚱᛋᛏ

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