Rh positive

Rh pos·i·tive

[ahr-eych poz-i-tiv] .
noun
See under Rh factor.

Origin:
1955–60

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Rh positive is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Dictionary.com Unabridged

Rh fac·tor

[ahr-eych fak-ter]
noun Physiology.
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. 2012.
Cite This Source Link To Rh positive
Collins
World English Dictionary
Rh positive
 
n
1.  blood containing the Rh factor
2.  a person having such blood

Collins English Dictionary - Complete & Unabridged 10th Edition
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