Source : Webster's Revised Unabridged Dictionary (1913)

Oogonium \O`["o]*go"ni*um\, n.; pl. L. {O["o]gonia}, E.
   {O["o]goniums}. [NL., fr. Gr. w,'o`n an egg + ? offspring.]
   (Bot.)
   A special cell in certain cryptogamous plants containing
   o["o]spheres, as in the rockweeds ({Fucus}), and the orders
   {Vaucherie[ae]} and {Peronospore[ae]}.

Fucus \Fu"cus\, n.; pl. {Fuci}. [L. rock lichen, orchil, used as
   a red dye, red or purple color, disguise, deceit.]
   1. A paint; a dye; also, false show. [Obs.]

   2. (Bot.) A genus of tough, leathery seaweeds, usually of a
      dull brownish green color; rockweed.

   Note: Formerly most marine alg? were called fuci.

Source : WordNet®

fucus
     n : any member of the genus Fucus
     [also: {fuci} (pl)]