We found 13 dictionaries that define the word long bones:

General (4 matching dictionaries)

1. long bones: Merriam-Webster
2. long bones: Vocabulary.com
3. long bones: Wiktionary
4. Long bones: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

5. Long bones: Encyclopedia

Medicine (8 matching dictionaries)

6. long bones: Merriam-Webster Medical Dictionary
7. Health and Wellness Dictionary (No longer online)
8. Probert Encyclopaedia of Medicine (No longer online)
9. Long bones: Gray's Anatomy (1918)
10. National MCH Center for Child Death Review (No longer online)
11. Long bones: MEDLINE plus Illustrated Medical Encyclopedia
12. Long bones: Medical dictionary
13. University of Maryland Glossary of Medical Terms (No longer online)

(Note: See long_bone as well.)

Definitions from Wiktionary (long bone) ▸ noun:  (anatomy) Any of the relatively slender bones of the upper and lower extremities. ▸ Also see long_bone Phrases: certain long bones, more... ▸ Words similar to long bones ▸ Usage examples for long bones ▸ Idioms related to long bones ▸ Wikipedia articles (New!) ▸ Words that often appear near long bones ▸ Rhymes of long bones ▸ Invented words related to long bones