Niobe Syllabification: (Ni·o·be)Pronunciation: /ˈnīəbē/ Greek MythologyDefinition of Niobe the daughter of Tantalus. Apollo and Artemis, enraged because Niobe boasted herself superior to their mother Leto, slew her children and turned her into a stone. Niobe in other Oxford dictionaries Definition of Niobe in the British & World English dictionary