pennatula

from WordNet (r) 3.0 (2006)

Pennatula
    n 1: type genus of the family Pennatulidae: sea pens [syn:
         {Pennatula}, {genus Pennatula}]

from The Collaborative International Dictionary of English v.0.48

Pennatula \Pen*nat"u*la\, n.; pl. L. {Pennatul[ae]}, E.
   {Pennatulas}. [NL., fr. L. penna a feather.] (Zool.)
   Any one of numerous species of {Pennatula}, {Pteroides}, and
   allied genera of {Alcyonaria}, having a featherlike form; a
   sea-pen. The zooids are situated along one edge of the side
   branches.
   [1913 Webster]