Source : Webster's Revised Unabridged Dictionary (1913)

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.