From Longman Dictionary of Contemporary Englishninjanin‧ja /ˈnɪndʒə/ noun [countable] in the past, a Japanese fighter with special skills
Examples from the Corpus
ninja• a ninja warrior• It was inevitable that his Ninja mutant turtle followed!• Steve Francis still plays with the joyous ferocity of the kid ninja warrior.• The Ninja complied with no code of honour in combat situations.Origin ninja (1900-2000) Japanese 