We found 4 dictionaries that define the word medullary sheaths:

General (3 matching dictionaries)

1. medullary sheaths: Merriam-Webster
2. medullary sheaths: Collins English Dictionary
3. medullary sheaths: Wiktionary

Medicine (1 matching dictionary)

4. medullary sheaths: Merriam-Webster Medical Dictionary

(Note: See medullary_sheath as well.)

Definitions from Wiktionary (medullary sheath) ▸ noun:  (botany) A thin layer surrounding the pith. ▸ Also see medullary_sheath ▸ Words similar to medullary sheaths ▸ Usage examples for medullary sheaths ▸ Idioms related to medullary sheaths ▸ Wikipedia articles (New!) ▸ Words that often appear near medullary sheaths ▸ Rhymes of medullary sheaths ▸ Invented words related to medullary sheaths