WordNet (r) 3.0 (2006):

Angiospermae
    n 1: comprising flowering plants that produce seeds enclosed in
         an ovary; in some systems considered a class (Angiospermae)
         and in others a division (Magnoliophyta or Anthophyta)
         [syn: Angiospermae, class Angiospermae,
         Magnoliophyta, division Magnoliophyta, Anthophyta,
         division Anthophyta]