An·ther·id·i·um n.; pl. Antheridia   Bot. The male reproductive apparatus in the lower plants, consisting of a cell or other cavity in which spermatozoids are produced; -- called also spermary.  -- An*ther*id*i*al a.
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  antheridium
       n : the male sex organ of spore-producing plants; produces
           antherozoids; equivalent to the anther in flowers
       [also: antheridia (pl), andtheridia (pl)]