from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The characteristic movement or orientation of an organism or cell along a chemical concentration gradient either toward or away from the chemical stimulus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the movement of a cell or an organism in response to a chemical stimulant
from the GNU version of the Collaborative International Dictionary of English
- The sensitiveness exhibited by small free-swimming organisms, as bacteria, zoöspores of algæ, etc., to chemical substances held in solution. They may be attracted (positive chemotaxis) or repelled (negative chemotaxis).
from The Century Dictionary and Cyclopedia
- n. The locomotion of organisms or of cells in relation to chemical substances, or the property of certain chemical substances to attract or repel living cells at the point of action: in the first instance there is positive chemotaxis, in the second negative chemotaxis. The peculiar response of the white blood-corpuscles to chemotactic stimulation is of fundamental importance in the defense of the animal organism against bacterial invasion.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. movement by a cell or organism in reaction to a chemical stimulus
chemo- + taxis (Wiktionary)