We found 27 dictionaries that define the word blood group:

General (18 matching dictionaries)

1. blood group: Merriam-Webster
2. blood group: Oxford Learner's Dictionaries
3. blood group: American Heritage Dictionary of the English Language
4. blood group: Collins English Dictionary
5. blood group: Vocabulary.com
6. blood group: Cambridge Advanced Learner's Dictionary
7. blood group: Wiktionary
8. blood group: The Wordsmyth English Dictionary-Thesaurus
9. blood group: Infoplease Dictionary
10. blood group: Dictionary.com
11. Blood Group, Blood group: Wikipedia, the Free Encyclopedia
12. blood group: Rhymezone
13. blood group: FreeDictionary.org
14. blood group: Mnemonic Dictionary
15. blood group: TheFreeDictionary.com
16. blood group: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

17. blood group: Legal dictionary

Computing (1 matching dictionary)

18. blood group: Encyclopedia

Medicine (7 matching dictionaries)

19. blood group: Merriam-Webster Medical Dictionary
20. Dorland's Illustrated Medical Dictionary (No longer online)
21. Blood group: MedTerms.com Medical Dictionary
22. online medical dictionary (No longer online)
23. Kidney Patient Guide Glossary (No longer online)
24. blood group, group, blood: Medical dictionary
25. Blood group: Drug Medical Dictionary

(Note: See blood_grouping as well.)

Definitions from Wiktionary (blood group) ▸ noun:  A blood type. Similar: blood type, ABO group, type, seropositive, acute lymphoblastic leukemia, blood bank, agammaglobulinemic, autoagglutinin, universal donor, hemagglutination, more... Opposite: blood type, blood group system, blood antigen Types: A, B, AB, O, more... Phrases: ABO blood group system, abo blood group, blood group antigens, blood group antigen, lewis blood group system, more... ▸ Words similar to blood group ▸ Usage examples for blood group ▸ Idioms related to blood group ▸ Wikipedia articles (New!) ▸ Words that often appear near blood group ▸ Rhymes of blood group ▸ Invented words related to blood group