资料来源 : Webster's Revised Unabridged Dictionary (1913)

Polycystid \Pol`y*cys"tid\, n. (Zo["o]l.)
   (a) One of the Polycystidea.
   (b) One of the Polycystina. -- a. Pertaining to the
       Polycystidea, or the Polycystina.