We found 29 dictionaries that define the word crossing over:

General (14 matching dictionaries)

1. crossing-over, crossing over: Merriam-Webster
2. crossing over: Oxford Learner's Dictionaries
3. crossing over: American Heritage Dictionary of the English Language
4. crossing over: Collins English Dictionary
5. crossing over: Vocabulary.com
6. crossing over: Wiktionary
7. crossing-over: Webster's New World College Dictionary, 4th Ed.
8. crossing over: Infoplease Dictionary
9. crossing-over, crossing over: Dictionary.com
10. Crossing Over (film), Crossing Over, Crossing-over, Crossing-over (genetics): Wikipedia, the Free Encyclopedia
11. crossing over: Rhymezone
12. crossing over: FreeDictionary.org
13. crossing over: Mnemonic Dictionary
14. crossing-over, crossing over: TheFreeDictionary.com

Business (2 matching dictionaries)

15. crossing over: Legal dictionary
16. crossing over: Financial dictionary

Computing (1 matching dictionary)

17. crossing-over, crossing over: Encyclopedia

Medicine (6 matching dictionaries)

18. Dorland's Illustrated Medical Dictionary (No longer online)
19. Crossing over: MedTerms.com Medical Dictionary
20. online medical dictionary (No longer online)
21. Hypermedia Glossary Of Genetic Terms (No longer online)
22. crossing-over, crossing over: Medical dictionary
23. Crossing over: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)

24. crossing over: Idioms

Science (4 matching dictionaries)

25. Agricultural Thesaurus and Glossary (No longer online)
26. Drug Discovery and Development (No longer online)
27. crossing over: Evolution Glossary
28. AGRICULTURAL AND ENVIRONMENTAL BIOTECHNOLOGY (No longer online)

Slang (1 matching dictionary)

29. Crossing Over: Urban Dictionary

(Note: See crossing_overs as well.)

Definitions from Wikipedia (Crossing Over) ▸ noun:  a 2009 American crime drama film written and directed by Wayne Kramer. Opposite: non-crossover, non-recombination, non-exchange Phrases: somatic crossing over, unequal crossing over, crossing over between, more... ▸ Words similar to crossing over ▸ Usage examples for crossing over ▸ Idioms related to crossing over ▸ Wikipedia articles (New!) ▸ Words that often appear near crossing over ▸ Rhymes of crossing over ▸ Invented words related to crossing over