oogonium

from The Collaborative International Dictionary of English v.0.48

Oogonium \O`o*go"ni*um\, n.; pl. L. {Oogonia}, E. {Oogoniums}.
   [NL., fr. Gr. w,'o`n an egg + ? offspring.] (Bot.)
   A special cell in certain cryptogamous plants containing
   oospheres, as in the rockweeds ({Fucus}), and the orders
   {Vaucherieae} and {Peronosporeae}.
   [1913 Webster]