cid, n. [Sp., fr. Ar. seid lord.].
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Chief or commander; in Spanish literature, a title of Ruy Diaz, Count of Bivar, a champion of Christianity and of the old Spanish royalty, in the 11th century. [1913 Webster]
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An epic poem, which celebrates the exploits of the Spanish national hero, Ruy Diaz. [1913 Webster]