from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The movement of a chemical substance across a cell membrane without expenditure of energy by the cell, as in diffusion.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. transport of a substance across a cell membrane by diffusion; expenditure of energy is not required
Sorry, no etymologies found.
Sorry, no example sentences found.