blood type

noun

Origin:
1930–35

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Collins
World English Dictionary
blood type
 
n
another name for blood group

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

blood type
1928, from blood + type. That there were different types of human blood was discovered c.1900 during early experiments in transfusion.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

blood type n.

  1. The specific reaction pattern of red blood cells of an individual to the antisera of one blood group as, for example, of the ABO blood group, which consists of four major blood types, O, A, B, and AB.

  2. Blood group.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
blood type  
Any of the four main types into which human blood is divided: A, B, AB, and O. Blood types are based on the presence or absence of specific antigens on red blood cells. Also called blood group.

Our Living Language  : Blood transfusions used to be the treatment of last resort, since they often caused death. But in the 1890s Austrian scientist Karl Landsteiner began to solve the transfusion puzzle when he found that all human red blood cells belonged to one of four groups which he named A, B, AB, and O. The types refer to antigens found on the surface of these cells. Antibodies circulating in a person's blood normally recognize the antigens in that same person's blood cells and don't react with them. However, if a person with one blood type is transfused with blood of another type, the antibodies bind to the foreign antigens, causing dangerous clumping of the blood. Thus the key to a successful transfusion is to give a person blood that has matching antigens. In the first half of the twentieth century, the study of Rhesus monkeys, which share many biological characteristics with humans, gave rise to the recognition of a human blood protein called the Rh factor. People who have this blood protein are considered Rh positive, while individuals who lack the protein are referred to as Rh negative. The Rh factor is connected to an individual's blood type. If a person has type AB blood with a positive Rh factor, his or her blood type is referred to as AB positive. The Rh factor causes a problem in a fetus whose blood is Rh positive and whose mother is Rh negative because the mother's negative blood attacks the positive blood of the fetus. In this instance, a blood transfusion to the fetus can save its life.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

blood type definition


One of many groups into which a person's blood can be categorized, based on the presence or absence of specific antigens in the blood. Blood type is inherited.

Note: Blood transfusions can be given only between donors and recipients who have compatible types; if the types are not compatible, the blood of the recipient forms antibodies against the blood of the donor. There are four basic groupings — A, B, AB, and O — and within these groupings, the Rh factor may be present or absent.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

blood type

classification of blood based on inherited differences (polymorphisms) in antigens on the surfaces of the red blood cells (erythrocytes). Inherited differences of white blood cells (leukocytes), platelets (thrombocytes), and plasma proteins also constitute blood groups, but they are not included in this discussion.

Learn more about blood type with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The molecules contain the blueprint for biological development, determining everything from hair color to blood type.
Before a transplant, your blood type and tissue type will be carefully matched with eligible donors.
Blood samples used for lab work do not match the patient's blood type.
Anyone with any blood type can contribute to her cause.
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