Acronyms that contain the term o-
What does o- mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: o-.
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What does o- mean?
- A blood type that has no antigens. It lacks the A, B and Rh factors on the blood cells. It is the universal donor for blood and can give blood to any blood type, but can only receive O- blood.