Search Result for "rh-negative": 
Wordnet 3.0

ADJECTIVE (1)

1. of persons (or their blood) lacking the Rh factor present in their red blood cells; 



WordNet (r) 3.0 (2006):

rh-negative
    adj 1: of persons (or their blood) lacking the Rh factor present
           in their red blood cells [ant: rh-positive]