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rhesus factor
rhesus factor /ˈriː.səsˌfæk.tər/ aep /ˈriː.səsˌfæk.tɚ/ noun [S] (WRITTEN ABBREVIATION Rh factor) specialized
► F0 a substance in the red blood cells of most people that causes the production of antibodies in the blood: » People whose blood contains the rhesus factor are rhesus positive (Rh+) and those whose blood does not contain it are rhesus negative (Rh-).Thesaurus+: ↑The circulatory system and blood |