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From: WordNet (r) 2.0

 subdivision Pinophytina
      n : 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]