WordNet (r) 3.0 (2006):

class Pinopsida
    n 1: most conifers: in some systems classified as a class
         (Pinopsida) and in others as a subdivision (Pinophytina);
         used in some classifications for one of five subdivisions
         of Gymnospermophyta [syn: Pinopsida, class Pinopsida,
         Pinophytina, subdivision Pinophytina]