The Collaborative International Dictionary of English v.0.48:

Sporangium \Spo*ran"gi*um\ (sp[-o]*r[a^]n"j[i^]*[u^]m), n.; pl.
   Sporangia (sp[-o]*r[a^]n"j[i^]*[.a]). [NL., fr. Gr. ? a
   sowing, seed + ? a receptacle.] (Bot.)
   A spore case in the cryptogamous plants, as in ferns, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Zoosporangium \Zo`o*spo*ran"gi*um\, n.; pl. -sporangia. [NL.
   See Zoo-, and Sporangium.] (Bot.)
   A spore, or conceptacle containing zoospores.
   [1913 Webster]