What is "perigonium"

Perigonium \Per`i*go"ni*um\, n.; pl. Perigonia. [NL.] Same as Perigone.

n. 1 The sterile parts of a flower; collectively, the sepals and petals (or tepals); the perianth. 2 The modified leaves around the antheridia in a bryophytic plant. 3 (context dated English) The wall of the sporosac in a hydroid.

1. n. collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils [syn: perianth, chlamys, floral envelope, perigone]

2. [also: perigonia (pl)]