The Collaborative International Dictionary
Zoosporangium
Zoosporangium \Zo`["o]*spo*ran"gi*um\, n.; pl. -sporangia. [NL. See Zo["o]-, and Sporangium.] (Bot.) A spore, or conceptacle containing zo["o]spores.
Wiktionary
zoosporangium
n. (context botany English) A sporangium, or conceptacle containing or producing zoospores.