a combining form meaning “second,” used in the formation of compound words: deuterocanonical.
Also especially before a vowel, deuter-.

Origin of deutero-

< Greek, combining form of deúteros Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for deutero-


deuto-, before a vowel deuter- or before a vowel deut-

combining form

second or secondarydeuterogamy; deuterium
(in chemistry) indicating the presence of deuterium

Word Origin for deutero-

from Greek deuteros second
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

Medicine definitions for deutero-



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

Science definitions for deutero-


A prefix meaning “second” or “secondary,” as in deuterostome, an animal whose mouth is the second opening to develop.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.