Word Study
ginkgopsida
CIDE DICTIONARY
ginkgopsida, n.
A division of trees comprising the ginkgos. In some systems it is classified as a class (Ginkgopsida ) and in others as a subdivision (Ginkgophytina or Ginkgophyta ); used in some classifications for one of five subdivisions of Gymnospermophyta. [WordNet 1.5]
For further exploring for "ginkgopsida" in Webster Dictionary Online