World English Dictionary
medulla (mɪˈdʌlə)
n , pl -las, -lae
1.  anatomy
 a.  the innermost part of an organ or structure
 b.  short for medulla oblongata
2.  botany another name for pith
[C17: from Latin: marrow, pith, probably from medius middle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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