Search Result for "molecular biology":
Wordnet 3.0

NOUN (1)

1. the branch of biology that studies the structure and activity of macromolecules essential to life (and especially with their genetic role); 



WordNet (r) 3.0 (2006):

molecular biology
    n 1: the branch of biology that studies the structure and
         activity of macromolecules essential to life (and
         especially with their genetic role)