We found 13 dictionaries that define the word gray substance:

General (7 matching dictionaries)

1. gray substance: Vocabulary.com
2. gray substance: Dictionary.com
3. Gray substance: Wikipedia, the Free Encyclopedia
4. gray substance: Rhymezone
5. gray substance: FreeDictionary.org
6. gray substance: Mnemonic Dictionary
7. gray substance: TheFreeDictionary.com

Business (1 matching dictionary)

8. gray substance: Legal dictionary

Computing (1 matching dictionary)

9. gray substance: Encyclopedia

Medicine (4 matching dictionaries)

10. gray substance: Merriam-Webster Medical Dictionary
11. Dorland's Illustrated Medical Dictionary (No longer online)
12. online medical dictionary (No longer online)
13. gray substance: Medical dictionary

(Note: See gray_substances as well.)

Definitions from WordNet (gray substance) ▸ noun:  greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons Opposite: white matter ▸ Words similar to gray substance ▸ Usage examples for gray substance ▸ Idioms related to gray substance ▸ Wikipedia articles (New!) ▸ Words that often appear near gray substance ▸ Rhymes of gray substance ▸ Invented words related to gray substance