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The Collaborative International Dictionary
Sparth

Sparth \Sparth\, n. [Cf. Icel. spar?a.] An Anglo-Saxon battle-ax, or halberd. [Obs.]

He hath a sparth of twenty pound of weight.
--Chaucer.

Wiktionary
sparth

n. (context obsolete English) A battle-axe or halberd.