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From The Collaborative International Dictionary of English v.0.48:
Niobe \Ni"o*be\, n. [L. Nioba, Niobe, Gr. ?.] (Class. Myth.) The daughter of Tantalus, and wife of Amphion, king of Thebes. Her pride in her children provoked Apollo and Diana, who slew them all. Niobe herself was changed by the gods into stone. [1913 Webster]