orca Look up orca at Dictionary.com
"killer whale," 1846, introduced as a generic term for the species by J. Richardson & J.E. Gray in "The zoology of the voyage of HHS 'Erebus' & 'Terror,' " from L. orca "cetacean, a kind of whale." Earlier in Eng., orc, ork "large whale" (c.1590), from Fr. orque, had been used vaguely of sea monsters (see orc).