Karyo- Definition
 karēō, karēə 
    prefix
  
 Cell nucleus.
 Karyogamy.
 American Heritage 
Nut; kernel.
 Caryopsis.
 American Heritage 
    affix
  
 Nut, kernel.
 Webster's New World 
The nucleus of a cell.
 Karyolymph.
 Webster's New World 
Origin of Karyo-
-  
New Latin from Greek karuo- nut from karuon kar- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 -  
ModL < Gr karyon, a nut, kernel < IE base *kar-, hard
From Webster's New World College Dictionary, 5th Edition
 From Ancient Greek κάρυον (karuon, “kernel”).
From Wiktionary
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