from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to the Rh factor.

from The Century Dictionary.

  • The chemical symbol of rhodium.
  • An initial sequence, originally an aspirated r, occurring in English, etc., in words of Greek origin.
  • noun An abbreviation of Royal Horse Artillery.
  • noun An abbreviation of Royal Horse Guards.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry Symbol for rhodium.
  • initialism medicine The Rhesus factor.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones; each of these hormones causes the anterior pituitary to secrete a specific hormone
  • noun a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
  • noun a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia


Sorry, no etymologies found.


  • Rhogam is a human blood-derived vaccine that is typically given to Rh - mothers (my wife) who give birth to Rh+ babies.

    Dr. Jeffrey McCombs: The Adventures of a Preterm Daddy: Part II

  • So what actually does the Rh factor is to somewhat reduce the possibilities of Rh- women of having children with Rh+ men.

    Neanderthal DNA

  • In fact it's possible, I guess, that the very Rh disease itself may have caused higher concentrations of Rh- by killing Rh+ unborn children.

    Neanderthal DNA

  • In fact, the only among your children that could have the Rh disease would be those with the Rh+ phenotype if the mother is Rh-, of course.

    Neanderthal DNA

  • It has been suggested that the mixing of Rh - and Rh+ blood groups reflects the mixing of hunter-gatherers and farmers in after the Ice Age.

    ScienceBlogs Channel : Life Science

  • Unlike ABO groups**, most people with Rh - blood don't have antibodies against Rh unless they've had specific exposures-like, say, childbirth of an Rh+ baby.


  • So, in the absence of technical help, available only in the last 50 or so years, an Rh - person and their Rh+ spouse could have one, maybe 2 children together at most.


  • Blood is either Rh positive (Rh+) or Rh negative (Rh -).

    infoplease - Daily Almanac

  • The first Rh - baby is OK and any subsequent Rh+ fetus would be stillborn due to attack from the mother's antibodies reacting to testosterone.

    ProgressiveIslam.Org - Comments

  • This test will determine your blood type as well as show if you are Rhesus positive (Rh+) or negative (Rh -). Master Site Feed


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