The Collaborative International Dictionary of English v.0.48:

Oophore \O"o*phore\, n. [Gr. ? egg-bearing; w,'o`n an egg +
   fe`rein to bear.] (Bot.)
   An alternately produced form of certain cryptogamous plants,
   as ferns, mosses, and the like, which bears antheridia and
   archegonia, and so has sexual fructification, as contrasted
   with the sporophore, which is nonsexual, but produces
   spores in countless number. In ferns the oophore is a minute
   prothallus; in mosses it is the leafy plant.
   [1913 Webster]