WordNet (r) 3.0 (2006):

class Taxopsida
    n 1: yews: in some systems classified as a class (Taxopsida) and
         in others as a subdivision (Taxophytina) used in some
         classifications for one of five subdivisions of
         Gymnospermophyta [syn: Taxopsida, class Taxopsida,
         Taxophytina, subdivision Taxophytina]