Source : Webster's Revised Unabridged Dictionary (1913)

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.