The Collaborative International Dictionary of English v.0.48:

Conidium \Co*nid"i*um\, n.; pl. Conida. [NL.] (Bot.)
   A peculiar kind of reproductive cell found in certain fungi,
   and often containing zoospores.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conidium
    n 1: an asexually produced fungal spore formed on a conidiophore
         [syn: conidium, conidiospore]