elasmo-

(Greek: to drive, strike, beat out; general application is "beaten metal, metal plate")

elasmobranch
A fish with a cartilaginous skeleton; such as, a shark, ray, or skate.
Elasmosaurus
A “plate (bone) lizard” from Late Cretaceous North America. It was a plesiosaur, not a dinosaur. Named by Edward Drinker Cope (1840-1897) in 1868.
Elasmotherium
A "Thin-Plate Beast" which was a genus of giant rhinoceros.