Source : Webster's Revised Unabridged Dictionary (1913)

Sporangium \Spo*ran"gi*um\, n.; pl. {Sporangia}. [NL., fr. Gr. ?
   a sowing, seed + ? a receptacle.] (Bot.)
   A spore case in the cryptogamous plants, as in ferns, etc.

Source : WordNet®

sporangium
     n : organ containing or producing spores [syn: {spore case}, {spore
         sac}]
     [also: {sporangia} (pl)]