Search Result for "active transport":
Wordnet 3.0

NOUN (1)

1. transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy; 



WordNet (r) 3.0 (2006):

active transport
    n 1: transport of a substance (as a protein or drug) across a
         cell membrane against the concentration gradient; requires
         an expenditure of energy