Definition that contains atop
- tier one of two or more layers one atop another
- triceratops huge ceratopsian dinosaur having three horns and the neck heavily armored with a very solid frill
- frill (paleontology) a bony plate that curves upward behind the skull of many ceratopsian dinosaurs
- velociraptor small active carnivore that probably fed on protoceratops; possibly related more closely to birds than to other dinosaurs
- keratoconus abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia
- yellow mariposa tulip mariposa having clusters of a few large deep yellow bell-shaped flowers atop slender stems; California coastal ranges
- calochortus macrocarpus mariposa having loose clusters of one to three handsome lilac flowers resembling umbels atop stout erect stems; arid northwestern North America east of Cascade Mountains from southern British Columbia to northern California
- sand stargazer small pallid fishes of shoal tropical waters of North America and South America having eyes on stalks atop head; they burrow in sand to await prey
- order ranales herbs, shrubs and trees: includes families Ranunculaceae; Annonaceae; Berberidaceae; Magnoliaceae; Menispermaceae; Myristicaceae; Nymphaeaceae; Lardizabalaceae; Lauraceae; Calycanthaceae; Ceratophyllaceae; Cercidiphyllaceae
- pachycephalosaurus bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found