o-

noun

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.

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Meanings

noun
  1. 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.
prefix
  1. chemistryortho-
Cite this entry
APA

o-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/o-

MLA

“o-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/o-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “o-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/o-.

Source: o- on Wiktionary, CC BY-SA 4.0.