from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Movement of an organism, especially a bacterium, toward or away from air or oxygen.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Movement of an organism either towards or away from a region of higher oxygen content.
from the GNU version of the Collaborative International Dictionary of English
- n. The positive or negative stimulus exerted by oxygen on aërobic and anaërobic bacteria.
from The Century Dictionary and Cyclopedia
- n. The movement of cells or organisms in relation to a source or supply of air.
Sorry, no etymologies found.