Webster's English Dictionary

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sporangium

spo.ran.gi.um \sp*-'ran-je--*m\ \-je--*\ n or spo.ran.gia [NL, fr. spor- + 
   Gk angeion vessel - more at ANGI-] pl  : a case within which usu. asexual 
   spores are produced whether a cell (as  in bacteria or algae) producing 
   spores endogenously or a complex structure (as in a fern)