"To billow", "Big wave." A billow maiden, one of the nine daughters of the sea god Ægir and his wife Rán. She is attested in Skáldskaparmál, which quotes a stanza by the Icelandic skald Óttarr svarti:
- Ye shear with shaven rudder
- Billows moisty-deep; the broad sheet,
- Which girls spun, on the mast-head
- With the Roller's Reindeer sported.
- Skáldskaparmál, 25, 60.