Search Result for "universal donor":
Wordnet 3.0

NOUN (1)

1. a person whose type O Rh-negative blood may be safely transfused into persons with other blood types; 



The Collaborative International Dictionary of English v.0.48:

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]


WordNet (r) 3.0 (2006):

universal donor
    n 1: a person whose type O Rh-negative blood may be safely
         transfused into persons with other blood types