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
- catoptrical of or relating to catoptrics; produced by or based on mirrors
- kaposi's varicelliform eruption a now rare complication of vaccinia superimposed on atopic dermatitis with high fever and generalized vesicles and papulovesicles
- family ceratophyllaceae coextensive with the genus Ceratophyllum: hornworts
- desert mariposa tulip mariposa with clusters of bell-shaped vermilion or orange or yellow flowers atop short stems; southern California to Arizona and Mexico
- yellow mariposa tulip mariposa having clusters of a few large deep yellow bell-shaped flowers atop slender stems; California coastal ranges