1. (noun)Gnetopsida, class Gnetopsida, Gnetophytina, subdivision Gnetophytina, Gnetophyta gymnospermous flowering plants; supposed link between conifers and angiosperms; in some systems classified as a class (Gnetopsida) and in others as a subdivision (Gnetophytina or Gnetophyta) Synonyms: subdivisionGnetophytina, classGnetopsida