名詞 medulla:

1. a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
   同義詞：myelin, myeline
2. lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
   同義詞：medulla oblongata, bulb
3. the inner part of an organ or structure in plant or animal

me.dul.la

n.（名詞）
【復(fù)數(shù)】 me.dul.las 或 me.dul.lae [-dôl.ô]
The inner core of certain organs or body structures, such as the marrow of bone.
髓質(zhì)：某些器官或身體結(jié)構(gòu)的內(nèi)部或深部，如骨髓
The medulla oblongata.
延髓
See myelin
參見 myelin
Botany
【植物學(xué)】
The pith in the stems or roots of certain plants.
木髓：某些植物莖或根中之髓質(zhì)
The central portion of a thallus in certain lichens and red or brown algae.
菌髓：某些地衣和紅色或棕色藻類之葉狀體的中心部分

來源：
Middle English
中古英語
from Latin
源自 拉丁語
perhaps alteration influenced by medius [middle] * see medial
可能為 受 medius的影響 [中間的] *參見 medial
of *merulla
*merulla的變化

【引伸】
medul.lar 或
med.ullar.y