orc-, orca-

(Greek > Latin: a kind of whale; large sea creature)

orca (s) (noun), orcas (pl)
Known as a killer whale: "The orca is technically a dolphin, and by far the largest member of that group."

"Orcas are known as killer whales and they hunt in packs, and although the bulk of their diet consists of fish and cephalopods; such as, squid, they also eat seals, sea lions, penguins, dolphins, and porpoises, and have been observed attacking larger whales, including the blue whale."

"Orcas have a remarkably wide distribution, inhabiting all waters around the world, from polar seas to tropical waters, although they seem most numerous in the Atlantic and Pacific oceans."

—Compiled from The World's Whales
by Stanley M. Minasian, Kenneth C. Balcomb, and Larry Foster;
Smithsonian Books; Washington, D.C.; Distributed by W.W. Norton and Company;
1984; New York; page 178.
Orca destructor
A killer whale.
Orcinus orca
A killer whale (formerly Orca gladiator).