medullation

American  

[med-l-ey-shuhn, mej-uh-ley-] / ˌmɛd lˈeɪ ʃən, ˌmɛdʒ əˈleɪ- /

noun

Biology.

1. the formation of a medullary sheath about a nerve fiber.

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Etymology

Origin of medullation

medull(a) + -ation

Example Sentences

Donaldson showed that if the eyelid of a young kitten be forced open prematurely at birth and stimulated with light, medullation was premature and imperfect; so, too, if proper exercise is deferred too long, we know that little result is achieved.

From Project Gutenberg