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orc-, orca- (Greek > Latin: a kind of whale; large sea creature).


orca:
1. A killer whale.
2. When capitalized, the genus consisting of the killer whale.


The World's Whales, by Stanley M. Minasian, Kenneth C. Balcomb, and Larry Foster
(New York: Smithsonian Books, Washington, D.C.; Distributed by W.W. Norton and Company, 1984), p. 178.

Orca destructor:
A killer whale.
Orcinus orca:
A killer whale (formerly Orca gladiator).