Ystast

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

ystast

v. refl. to curdle (þat rennr saman ok ystist sem mjölk).

Possible runic inscription in Younger Futhark:ᚢᛋᛏᛅᛋᛏ

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