Source : Webster's Revised Unabridged Dictionary (1913)

Plumularia \Plu`mu*la"ri*a\, n.; pl. L. {Plumularl[ae]}, E.
   {Plumularias}. [NL.] (Zo["o]l.)
   Any hydroid belonging to {Plumularia} and other genera of the
   family {Plumularid[ae]}. They generally grow in plumelike
   forms.