Periderm

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Periderm \Per"i*derm\, n.
     1. (Bot.) The outer layer of bark.
        [1913 Webster]
  
     2. (Zool.) The hard outer covering of hydroids and other
        marine animals; the perisarc.


        [1913 Webster]