'Peridium' definitions:

Definition of 'peridium'

(from WordNet)
noun
Outer layer of the spore-bearing organ in many fungi

Definition of 'Peridium'

From: GCIDE
  • 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]