The Collaborative International Dictionary
Oophoridium
Oophoridium \O`["o]*pho*rid"i*um\, n.; pl. L. O["o]phorida, E. O["o]phoridiums. [NL., dim. fr. Gr. ?. See O["o]phore.] (Bot.) The macrosporangium or case for the larger kind of spores in heterosporous flowerless plants.
Wiktionary
oophoridium
n. (context botany English) The macrosporangium or case for the larger kind of spore in heterosporous flowerless plants.