What is a long knife, or short saber, common among Mohammedan nations, usually having a double curve, sometimes nearly straight. [Written also ataghan, attaghan.] Chaucer called?

yataghan — A long knife, or short saber, common among Mohammedan nations, usually having a double curve, sometimes nearly straight. [Written also ataghan, attaghan.] Chaucer. (Webster's 1913.)

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