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From The Collaborative International Dictionary of English v.0.48:
Osiris \O*si"ris\, prop. n. [L., fr. Gr. ?; of Egyptian origin.] (Myth.) One of the principal divinities of Egypt, the brother and husband of Isis. He was figured as a mummy wearing the royal cap of Upper Egypt, and was symbolized by the sacred bull, called Apis. Cf. Serapis. -- O*sir"i*an, a. [1913 Webster]