资料来源 : WordNet®

class Cycadopsida
     n : palmlike gymnosperms: includes the surviving order Cycadales
         and several extinct orders; possibly not a natural group;
         in some systems considered a class (Cycadopsida) and in
         others a subdivision (Cycadophytina or Cycadophyta) [syn:
          {Cycadopsida}, {Cycadophytina}, {subdivision
         Cycadophytina}, {Cycadophyta}, {subdivision Cycadophyta}]