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karyo-

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  1. a combining form meaning “nucleus of a cell,” used in the formation of compound words: karyotin.
Also caryo-.

Origin of karyo-

< Greek, combining form of káryon nut, kernel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for karyo-

karyo-

caryo-

combining form
  1. indicating the nucleus of a cellkaryogamy

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

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

karyo- in Medicine

karyo-

pref.
  1. Cell nucleus:karyogamy.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.