| 单词 | medulla |
| 释义 | medulla n. 1. the inner region of certain organs or tissues usu. when it is distinguishable from the outer region or cortex, as in hair or a kidney. 2. the myelin layer of certain nerve fibres. 3. the soft internal tissue of plants. Phrases and idioms medulla oblongata the continuation of the spinal cord within the skull, forming the lowest part of the brain stem. Derivatives medullary adj. Etymology: L, = pith, marrow, prob. rel. to medius middle |
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