o-

1. 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.

   一种无抗原的血型,红细胞上缺乏A、B和Rh因子,为万能供血者,可给任何血型输血,但只能接受O-型血。

正；邻(化学)