1. the killer whale, Orcinus orca.

noun plural orcas or orca

  1. a killer whale

n.“killer whale,” introduced as a generic term for the species by 1841, from earlier use in scientific names, from Latin orca “cetacean, a kind of whale.” Earlier in English, orc, ork “large whale” (c.1590), from French orque, had been used vaguely of sea monsters (see orc).

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