Wordnet 3.0
NOUN (1)
1.
(Greek mythology) the daughter of Tantalus whose boasting about her children provoked Apollo and Artemis to slay them all;
Niobe was turned to stone while bewailing her loss;
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]
WordNet (r) 3.0 (2006):
Niobe
n 1: (Greek mythology) the daughter of Tantalus whose boasting
about her children provoked Apollo and Artemis to slay them
all; Niobe was turned to stone while bewailing her loss