'Universal donor' definitions:
Definition of 'universal donor'
From: WordNet
noun
A person whose type O Rh-negative blood may be safely transfused into persons with other blood types
Definition of 'Universal donor'
From: GCIDE
- Universal donor \U`ni*ver"sal do"nor\, n. (Med.) a person belonging to the O blood group (of the ABO classification), who can safely donate blood to anyone. [PJC]