follow Dictionary.com

Today's Word of the Day means...

Rh negative

[ahr-eych neg-uh-tiv] /ˈɑrˈeɪtʃ ˈnɛg ə tɪv/
noun
1.
See under Rh factor.
Origin
1955-1960
1955-60

Rh factor

[ahr-eych fak-ter] /ˈɑrˈeɪtʃ ˌfæk tər/
noun, Physiology
1.
any of a type of specific antigen present on the surface of red blood cells, persons having inherited such antigens being designated Rh+ (Rh positive) and persons lacking them, a much smaller group, being designated Rh− (Rh negative) blood of Rh− persons is incompatible with Rh+ blood because of antibody reaction, and an Rh− woman who bears an Rh+ baby will have formed antibodies to the fetal blood that, unless removed from her bloodstream by apheresis in a subsequent pregnancy, will be carried across the placenta and destroy red blood cells of the next Rh+ fetus, resulting in erythroblastosis in the newborn.
Origin
1940-45; so called because first found in the blood of rhesus monkeys
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for rh-negative

Rh factor

noun
1.
an agglutinogen commonly found in human blood: it may cause a haemolytic reaction, esp during pregnancy or following transfusion of blood that does not contain this agglutinogen Full name rhesus factor See also Rh positive, Rh negative
Word Origin
C20: named after the rhesus monkey, in which it was first discovered

Rh negative

noun
1.
blood that does not contain the Rh factor
2.
a person having such blood
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
Cite This Source
Word Origin and History for rh-negative
Rh factor
1942, from rh(esus) (q.v.); so called because the blood group, and its effects, were discovered in the blood of rhesus monkeys (1941).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
rh-negative in Medicine

Rh factor n.
Any of several substances on the surface of red blood cells that induce a strong antigenic response in individuals lacking the substance.

Rh-negative adj.
Lacking an Rh factor.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
rh-negative in Science
Rh factor
  (är'āch')   
Any of several antigens present on the surface of red blood cells in most humans. People with Rh factors are classified as having a blood type that is Rh positive, while people who lack the antigen are said to be Rh negative and can produce powerful antibodies that destroy red blood cells if given a blood transfusion from an Rh-positive donor. A woman who is Rh negative and is pregnant with an Rh-positive fetus can produce antibodies that are life threatening to the fetus. See Note at blood type.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
rh-negative in Culture
Rh factor [(ahr-aych)]

Any of several substances found on the surface of red blood cells in persons.

Note: An Rh-negative woman who gives birth to an Rh-positive baby may develop antibodies to the Rh factor during her first pregnancy. These antibodies may cause a disorder in Rh-positive babies conceived afterward that could result in the death of the infant if the condition is not recognized and treated.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source

Word of The Day

Difficulty index for Rh negative

Few English speakers likely know this word

Word Value for rh

0
0
Scrabble Words With Friends

Quotes with rh-negative