• noun
• synonym
• antonym

• subclass Acnidosporidia (noun)
  1. a subclass of Sporozoa
• subclass Actinopoda (noun)
  1. heliozoans; radiolarians
• subclass Alismatidae (noun)
  1. one of four subclasses or superorders of Monocotyledones; comprises about 500 species in 14 families of aquatic and semiaquatic herbs
• subclass Amphineura (noun)
  1. a class of Gastropoda
• subclass Anapsida (noun)
  1. oldest known reptiles; turtles and extinct Permian forms
• subclass Archaeornithes (noun)
  1. primitive reptile-like fossil birds of the Jurassic or early Cretaceous
• subclass Archosauria (noun)
  1. a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts
• subclass Arecidae (noun)
  1. one of four subclasses or superorder of Monocotyledones; comprises about 6400 species in 5 families of trees and shrubs and terrestrial herbs and a few free-floating aquatics including: Palmae; Araceae; Pandanaceae and Lemnaceae
• subclass Asteridae (noun)
  1. a group of mostly sympetalous herbs and some trees and shrubs mostly with 2 fused carpels; contains 43 families including Campanulales; Solanaceae; Scrophulariaceae; Labiatae; Verbenaceae; Rubiaceae; Compositae; sometimes classified as a superorder
• subclass Branchiopoda (noun)
  1. primitive aquatic mainly freshwater crustaceans: fairy shrimps; brine shrimps; tadpole shrimps; can shrimps; water fleas
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