Search Result for "prothrombin": 
Wordnet 3.0

NOUN (1)

1. a protein in blood plasma that is the inactive precursor of thrombin;
[syn: prothrombin, factor II]



WordNet (r) 3.0 (2006):

prothrombin
    n 1: a protein in blood plasma that is the inactive precursor of
         thrombin [syn: prothrombin, factor II]