'ataghan' definitions:
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Yataghan \Yat"a*ghan\, n. [Turk. y[=a]t[=a]gh[=a]n.]
A long knife, or short saber, common among Mohammedan
nations, usually having a double curve, sometimes nearly
straight. [Written also ataghan, attaghan.] --Chaucer.
[1913 Webster]
