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a combining form meaning “nucleus of a cell,” used in the formation of compound words:
Also, caryo-.
Origin of karyo-
< Greek, combining form of káryon nut, kernel Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for karyo-


combining form
indicating the nucleus of a cell: karyogamy
Word Origin
from New Latin, from Greek karuon kernel, nut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for karyo-

before vowels kary-, word-forming element used since c.1874 in biological terms referring to cell nuclei, from Greek karyon "nut, kernel," possibly from PIE root *kar- "hard" (see hard (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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karyo- in Medicine

karyo- or caryo-
Cell nucleus: karyogamy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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