The Collaborative International Dictionary of English v.0.48:

Janizary \Jan"i*za*ry\, n.; pl. Janizaries. [F. janissaire,
   fr. Turk. ye[~n]i-tsheri new soldiers or troops.]
   A soldier of a privileged military class, which formed the
   nucleus of the Turkish infantry, but was suppressed in 1826.
   [written also janissary.]
   [1913 Webster]