medullary sheath
noun
1 Botany, (in some higher plants) a layer of cells surrounding the pith of the stem.
2 Histology and Physiology = myelin sheath (now rare ).
Origin
Early 19th century; earliest use found in Patrick Keith (1769–1840).
| 单词 | medullary sheath |
| 释义 | medullary sheathnoun 1 Botany, (in some higher plants) a layer of cells surrounding the pith of the stem. 2 Histology and Physiology = myelin sheath (now rare ). Origin |
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