Search Result for "peridium": 
Wordnet 3.0

NOUN (1)

1. outer layer of the spore-bearing organ in many fungi; 



The Collaborative International Dictionary of English v.0.48:

Peridium \Pe*rid"i*um\, n.; pl. Peridia. [NL., fr. Gr. peri`
   about + ?, a dim. ending.] (Bot.)
   The envelope or coat of certain fungi, such as the puffballs
   and earthstars.
   [1913 Webster]


WordNet (r) 3.0 (2006):

peridium
    n 1: outer layer of the spore-bearing organ in many fungi