dicho-

dicho-

or dich-
pref.
In two; into two parts: dichogamous.

[Greek dikho-, from dikha, in two; see dwo- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

dicho-

or before a vowel

dich-

combining form
in two parts; in pairs: dichotomy.
[from Greek dikho-, from dikha in two]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

dicho-

a combining form meaning “in two parts,” “in pairs”: dichogamous.
[< Greek, comb. form of dícha in two, asunder]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.