Sporðr

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

sporðr

(-s, -ar), m. tail of a fish, serpent, etc. (s. sem á fiski); standa e-m á sporði, to be a match for, be one’s superior (vitr maðr ertu, Eyólfr, svá at fáir munu standa á sporði þér); s. skjaldar, the lower pointed end of a shield (þreif B. sporð skjaldarins hinni hendinni ok rak í höfuð Þórði).

Possible runic inscription in Younger Futhark:ᛋᛒᚢᚱᚦᚱ

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