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
- catoptric of or relating to catoptrics; produced by or based on mirrors
- catoptrical of or relating to catoptrics; produced by or based on mirrors
- hornwort any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams
- onomatopoetic of or relating to or characterized by onomatopoeia
- allium acuminatum a common North American wild onion with a strong onion odor and an umbel of pink flowers atop a leafless stalk; British Columbia to California and Arizona and east to Wyoming and Colorado