1. the blood group whose red cells carry neither the A nor B antigens; - Example: "people with type O blood are universal donors" [syn: O, type O, group O]
WordNet (r) 3.0 (2006):
type O
n 1: the blood group whose red cells carry neither the A nor B
antigens; "people with type O blood are universal donors"
[syn: O, type O, group O]