- an abnormality characterized by the presence of an additional chromosome to the normal diploid number.
Origin of trisomy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for trisomy
In the eyes of many medical professionals, a child with Trisomy 18 is doomed.
Most prominent in all of the literature: Trisomy 18 is often fatal.
When we are able to pause for a time, Jeff and I read about Trisomy 18.
- the condition of having one chromosome of the set represented three times in an otherwise diploid organism, cell, etc. Trisomy of chromosome 21 results in Down's syndrome
C20: from tri- + (chromo) som (e) + -y ³
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 trisomy
Online Etymology Dictionary, © 2010 Douglas Harper
- The condition of having three copies of a given chromosome or chromosome segment in each somatic cell rather than the normal number of two.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- The condition of having three copies of a given chromosome in each body cell rather than the normal number of two.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.