- triceratops (n.)
- dinosaur genus, 1890, from Greek trikeratos "three-horned" + ops "face," literally "eye," from PIE *okw- "to see" (see eye (n.)). The first element is from tri- "three" (see three) + keras (genitive keratos) "horn of an animal," from PIE *ker- (1) "horn, head" (see horn (n.)).
