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| method of forming complex organic materials using sunlight as energy source |
| plants without a xylem and phloem to transport fluid and nutrients internally |
| medullary sheath | |
| —n | |
| 1. | anatomy a myelin layer surrounding and insulating certain nerve fibres |
| 2. | a layer of thick-walled cells surrounding the pith of the stems of some higher plants |
medullary sheath n.
See myelin sheath.