We found 28 dictionaries that define the word orca:

General (17 matching dictionaries)

1. orca: Merriam-Webster
2. orca: Oxford Learner's Dictionaries
3. orca: American Heritage Dictionary of the English Language
4. orca: Collins English Dictionary
5. orca: Vocabulary.com
6. Orca, orca: Wordnik
7. orca: Wiktionary
8. orca: Webster's New World College Dictionary, 4th Ed.
9. orca: Infoplease Dictionary
10. Orca, orca: Dictionary.com
11. orca: Online Etymology Dictionary
12. ORCA (Quantum Chemistry Program), ORCA (computer system), ORCA (quantum chemistry program), ORCA, Orca (DC Comics), Orca (Jaws boat), Orca (Serj Tankian album), Orca (assistive technology), Orca (comics), Orca (company), Orca (disambiguation), Orca (dog), Orca (film), Orca (movie), Orca (novel), Orca: Wikipedia, the Free Encyclopedia
13. orca: Rhymezone
14. orca: FreeDictionary.org
15. orca: Mnemonic Dictionary
16. orca: TheFreeDictionary.com
17. Orca: Dictionary of Phrase and Fable (1898)

Art (1 matching dictionary)

18. orca-: A Cross Reference of Latin and Greek Elements

Computing (3 matching dictionaries)

19. Orca: Free On-line Dictionary of Computing
20. Orca: Dictionary of Programming Languages
21. orca: Encyclopedia

Medicine (2 matching dictionaries)

22. online medical dictionary (No longer online)
23. orca: Medical dictionary

Miscellaneous (3 matching dictionaries)

24. Brilliant Dream Dictionary (No longer online)
25. ORCA: Acronym Finder
26. AbbreviationZ (No longer online)

Slang (2 matching dictionaries)

27. Orca: A Seattle Lexicon
28. orca: Urban Dictionary

(Note: See orcas as well.)

Definitions from Wiktionary (orca) ▸ noun:  A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly called the killer whale. Similar: killer whale, grampus, sea wolf, killer, orcinus orca, false killer whale, sei whale, fin whale, razorback, Irrawaddy dolphin, more... Opposite: dolphin, porpoise, small whale Types: killer whale, blackfish, grampus, narwhal, more... Phrases: orcinus orca, orca whales, orca whale, orca gladiator, Orca attack, more... Adjectives: male, young, female, captive, single, large, small, wild, latin, giant, orcinus Colors:     black,     white,     gray,     silver,     charcoal, more... ▸ Word origin ▸ Words similar to orca ▸ Usage examples for orca ▸ Idioms related to orca ▸ Wikipedia articles (New!) ▸ Popular adjectives describing orca ▸ Words that often appear near orca ▸ Rhymes of orca ▸ Invented words related to orca